[rdkb][common][bsp][Refactor and sync kernel from openwrt]

[Description]
Refactor and sync kernel from openwrt
1. update kernel version to 5.4.230
fdb637d [kernel][common][eth][Add heartbeat check for Aquantia firwmare download]

[Release-log]

Change-Id: I048c460140ba124d680f019c8d35447fe61d432e
37 files changed