[][MAC80211][WiFi6][mt76][rename bf debug cmd to align connac3]

[Description]
Change 2 BF related debug command naming to align connac3 name. The
reason why I want to make this change is to ensure that the same debug
command script can be used for both connac2 and connac3 chips
simultaneously.

The changed debug commands shows as below:
1. Read BF starec : txbf_sta_rec -> bf_starec_read
2. Read PFMU tag content : txbf_pfmu_tag_idx -> pfmu_tag_read

[Release-log]
N/A

Change-Id: I3fb5b3cd9e3045a99255fe6e8ba7eec8ff5f2ca4
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8173970
1 file changed