Description

Turns out the Khadas u-boot has some code hidden deep within pxe.c file to enable and disable lcd screen. As we don't use extlinux for vim1s and vim4, that doesn't get executed for us leaving the device to detect ghost screens. Hence copied the code to bootscript in order to disable the lcd screens when they are not really present. This makes the vim4 and vim1s a lot more responsive. Also fixes issue where we can't login to gnome because login screen was being rendered on non-existent lcd screen.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• [X] Tested new build on vim4. Only hdmi was getting detected as expected as I don't have any lcd screens attached

Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published in downstream modules

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