Integrate u-boot-seco-imx/seco_lf_v2021.04_develop_splash
[IMX6][VIDEO] fix video configuration
- CONFIG_VIDEO is incompatible with CONFIG_DM_VIDEO (needed for IMX IPUv3 graphics)
- CONFIG_SPLASH_SCREEN, CONFIG_SPLASH_SCREEN_ALIGN moved to defconfig
- they are defined in a Kconfig, so is better to put them in the defconfig
- CONFIG_SPLASH_SCREEN is checked in file common/stdio.c with the macro IS_ENABLED(), so it has to be defined in the defconfig in order to be correctly checked
- CONFIG_HIDE_LOGO_VERSION used to hide the version string on the display
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[IMX6-IMX8][SECO ENV] add default SPLASHIMAGE_ADDR value and set centered splash