- vim1s/vim4: remove uEnv.txt and default extlinux args, use simple arguments instead
- meson-s4t7.conf: hack: rereadpt (re-read partition table) in initrd local-top (for eMMC boot of oowow'ed image)
- meson-s4t7.conf: include both `u-boot.bin.sd.bin.signed` and `u-boot.bin.signed` in uboot package
- meson-s4t7: patch kernel for different dt "model" across VIM4 and "New VIM4"
- meson-s4t7.conf: set `EXTLINUX_SPECIFIC_FDT=no`, so u-boot auto-determines which DTB to use
- don't specify DTB; this way both the "original VIM4" and the "new VIM4" can boot with the same image