Merge branch '2021-05-06-misc-updates'
- Allow for boards to update bootargs before booting the OS (helpful in some forms of secure boot). - Enhance GPT write support. - gpio-sysinfo updates - Allow env to be appended from dtb
- Allow for boards to update bootargs before booting the OS (helpful in some forms of secure boot). - Enhance GPT write support. - gpio-sysinfo updates - Allow env to be appended from dtb