wifi: rtw89: mac: reduce PPDU status length for WiFi 6 chips

Since the RX counter in the PPDU status is not used,
it is disabled to reduce the waste of DLE quota.

Signed-off-by: Chia-Yuan Li <leo.li@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20250715035259.45061-3-pkshih@realtek.com