backport Linux v5.8 fbtft/fb_st7789v invert colors, proper gamma

Description

Without this patch, st7789 LCD is black/white inverted.

https://github.com/armbian/build/pull/2089

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None

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Done

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Created July 13, 2020 at 2:38 AM
Updated August 19, 2020 at 5:09 PM
Resolved July 13, 2020 at 2:40 AM