[][MAC80211][WED][Fix wdma rx hang on wed1 after SER]

[Description]
Fix wdma rx hang on wed1 after SER
1. wed1 need to do mtk_wed_hw_init after SER.
2. During SER, wed1 need to do reset prefetch index and prefetch FIFO.

[Release-log]

Change-Id: I1af1cf7861f696269f96a4a38736827329b2d2b7
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8513188
2 files changed