Backport of "kmssink: Add STM32 LTDC and NXP i.MX8M Plus LCDIFv3 auto-detection" into 1.20
requested to merge gstreamer-backport-bot/gstreamer:mr-4858-backport-into-1.20-kmssink-imx8mp-stm32mp into 1.20
Backport of !4858 (merged) "kmssink: Add STM32 LTDC and NXP i.MX8M Plus LCDIFv3 auto-detection".
Commits: