[][MAC80211][eth][Refactor internal patches]

[Description]
Refactor internal patches.

Refactor internal patches since coherent DMA functions have been
merged to the ETH driver.

[Release-log]
N/A


Change-Id: I3b3f4bd7122e9bc009bf6cb03962b1de27ed6978
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7216566
6 files changed