[][MAC80211][WiFi6][mt76][Add support for cheetah]

[Description]
Add support for cheetah
1. Add cheetah specific eeprom definition
2. Add cheetah 3T3R 2ss handling in mt7915_set_anntena for chainmask
3. Add testmode prek support for cheetah

Testmode RDUT status
1. basic tx/rx: local RDUT pass
2. pre-calibration: local RDUT pass
3. ZWDFS verification: TBD (not sure if ZWDFS is required or not)
4. ebf: local RDUT pass
5. ibf
   (a) 2G/5G cal with golden: local RDUT pass
   (b) 2G/5G cal with instrument: TBD

[Release-log]
N/A

Change-Id: Ie9291e87ed2df05a5215a511af698bf6e8adc7fe
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8188020
2 files changed