[Change and sync linux version from OpenWRT]

[Description]
Change and sync linux version from OpenWRT
1. sync kernel to Openwrt21.02 : v5.4.188
2. sync mtk kernel patch from mtk_feed

[Release-log]
N/A

96 files changed
tree: f6a86101a04da97461b6745e9eb9fccded60aefb
  1. classes/
  2. conf/
  3. recipes-connectivity/
  4. recipes-devtools/
  5. recipes-kernel/