wifi: rtw89: 8922a: add RF read/write v2

Implement indirect interface v2 to read/write RF registers via PHY
registers for 8922A.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240124033637.12330-5-pkshih@realtek.com