wifi: rtw88: 8821c: Fix false alarm count

total_fa_cnt is supposed to include cck_fa_cnt and ofdm_fa_cnt, not just
ofdm_fa_cnt.

Fixes: 96036123

 ("rtw88: 8821c: add false alarm statistics")
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/f3cb6d17-e4e4-44a7-9c9b-72aed994b5c9@gmail.com