wifi: rtw89: add EVM for antenna diversity

Take EVM into consideration when doing antenna diversity, and the priority
is higher than RSSI. Since EVM is more relevant to performance than RSSI,
especially in OTA environment.

Signed-off-by: Eric Huang <echuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230418012820.5139-8-pkshih@realtek.com