rtw88: do PHY calibration while starting AP

Calling calibration to yield expected PHY performance. We do this in STA
mode, so do this in AP mode as well.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220407095858.46807-6-pkshih@realtek.com