问题现象：OH系统移植后，接4K 屏HDMI。uboot的logo可以正常显示，可以正常进入系统。但是无法显示开机动画并进图形界面，命令行此时已经进入到系统。插拔hdmi线后，显示器显示系统桌面，而且可以正常操作。执行bootanimation，可以看到开机动画正常运行。

分析：查看modetest命令，发现接4K屏后没有preferred标志。请问下，这部分可以怎么处理下？

正常命令结果：

Connectors:
id      encoder status          name            size (mm)       modes   encoders
423     422     connected       HDMI-A-1        530x300         14      422
  modes:
        index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
  #0 1920x1080 60.00 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: preferred, driver
  #1 1920x1080i 30.00 1920 2008 2052 2200 1080 1084 1094 1125 74250 flags: phsync, pvsync, interlace; type: driver
  #2 1920x1080 50.00 1920 2448 2492 2640 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
  #3 1920x1080i 25.00 1920 2448 2492 2640 1080 1084 1094 1125 74250 flags: phsync, pvsync, interlace; type: driver
  #4 1280x1024 60.02 1280 1328 1440 1688 1024 1025 1028 1066 108000 flags: phsync, pvsync; type: driver
  #5 1280x960 60.00 1280 1376 1488 1800 960 961 964 1000 108000 flags: phsync, pvsync; type: driver
  #6 1280x720 60.00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver
  #7 1280x720 50.00 1280 1720 1760 1980 720 725 730 750 74250 flags: phsync, pvsync; type: driver
  #8 1024x768 70.07 1024 1048 1184 1328 768 771 777 806 75000 flags: nhsync, nvsync; type: driver
  #9 800x600 75.00 800 816 896 1056 600 601 604 625 49500 flags: phsync, pvsync; type: driver
  #10 800x600 72.19 800 856 976 1040 600 637 643 666 50000 flags: phsync, pvsync; type: driver
  #11 800x600 56.25 800 824 896 1024 600 601 603 625 36000 flags: phsync, pvsync; type: driver
  #12 720x576 50.00 720 732 796 864 576 581 586 625 27000 flags: nhsync, nvsync; type: driver
  #13 720x480 59.94 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver

接4K屏，modetest命令结果：

  modes:
        index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
  #0 3840x2160 60.00 3840 4016 4104 4400 2160 2168 2178 2250 594000 flags: phsync, pvsync; type: driver
  #1 3840x2160 50.00 3840 4896 4984 5280 2160 2168 2178 2250 594000 flags: phsync, pvsync; type: driver
  #2 3840x2160 30.00 3840 4016 4104 4400 2160 2168 2178 2250 297000 flags: phsync, pvsync; type: driver
  #3 3840x2160 25.00 3840 4896 4984 5280 2160 2168 2178 2250 297000 flags: phsync, pvsync; type: driver
  #4 3840x2160 24.00 3840 5116 5204 5500 2160 2168 2178 2250 297000 flags: phsync, pvsync; type: driver
  #5 1920x1080 60.00 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
  #6 1920x1080 50.00 1920 2448 2492 2640 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
  #7 1280x1024 60.02 1280 1328 1440 1688 1024 1025 1028 1066 108000 flags: phsync, pvsync; type: driver
  #8 1280x960 60.00 1280 1376 1488 1800 960 961 964 1000 108000 flags: phsync, pvsync; type: driver
  #9 1280x720 60.00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver
  #10 1280x720 50.00 1280 1720 1760 1980 720 725 730 750 74250 flags: phsync, pvsync; type: driver
  #11 1024x768 70.07 1024 1048 1184 1328 768 771 777 806 75000 flags: nhsync, nvsync; type: driver
  #12 800x600 75.00 800 816 896 1056 600 601 604 625 49500 flags: phsync, pvsync; type: driver
  #13 800x600 72.19 800 856 976 1040 600 637 643 666 50000 flags: phsync, pvsync; type: driver
  #14 800x600 56.25 800 824 896 1024 600 601 603 625 36000 flags: phsync, pvsync; type: driver
  #15 720x576 50.00 720 732 796 864 576 581 586 625 27000 flags: nhsync, nvsync; type: driver
  #16 720x480 59.94 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver