[][MAC80211][misc][Update makefile and config to copy 7915 and 7916 firmware]

[Description]
Add the following config
- CONFIG_PACKAGE_kmod-mt7915-firmware
- CONFIG_PACKAGE_kmod-mt7916-firmware

Refactor makefile patch

[Release-log]
N/A

Change-Id: I3cbf845b065b50677df1cf5831a3b6c2d8a948c0
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7030818
2 files changed