Integrate u-boot-seco-imx/seco_lf_v2021.04-c26_video
Commit: clea-os/bsp/nxp/u-boot-seco-imx@61b3b52b
[C26][ENV] update video overlay options
- add DP overlay option for CFG=A1
- add DP fw load on overlay option for CFG=A2
- add LVDS ChB 800x480 overlay option
- update multi-video overlay handling: instead of a single unified overlay for every multi-video option use multiple intercompatible video overlay to be used in several combinations
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Commit: clea-os/bsp/nxp/u-boot-seco-imx@0df57883
[C26][C43] remove unused reference board HDP FW load code