Draft: add support for C61 to RAUC/SysOTA
SECO Astrid (aka C61) uses two-phase U-Boot chain-loading into GRUB/EFI executable. We can leverage existing GRUB support to enable initial OTA support, without having the ability to update U-boot just yet.
Signed-off-by: Zygmunt Krynicki zygmunt.krynicki@huawei.com