[][OpenWrt Dev][Add support for sd/mmc devices to upgrade firmware on specific partitions]

[Description]
Add support for sd/mmc devices to upgrade firmware on specific partitions
specified by kernel cmdline

[Release-log]
N/A

Change-Id: I6348f3a77a3bd5be37c6f60f6a9bf6193e72f095
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5599885
2 files changed