wifi: ath11k: move references from rsvd2 to info fields

Remove references to reserved fields and add new info fields for
struct hal_rx_ppdu_end_user_stats. Reserved fields should not be
accessed, therefore existing references to it are to be changed to
referencing specific info fields.

Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1-00356-QCAHKSWPL_SILICONZ-1

Signed-off-by: Muna Sinada <quic_msinada@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/1692827868-15667-1-git-send-email-quic_msinada@quicinc.com