wifi: ath12k: refactor REO status ring handling

The entry of REO status ring of existing chips has a 64 bit TLV header,
hence below functions take a 64 bit TLV assumption by default

        ath12k_wifi7_dp_rx_process_reo_status()
        ath12k_wifi7_hal_reo_status_queue_stats()
        ath12k_wifi7_hal_reo_flush_queue_status()
        ath12k_wifi7_hal_reo_flush_cache_status()
        ath12k_wifi7_hal_reo_unblk_cache_status()
        ath12k_wifi7_hal_reo_flush_timeout_list_status()
        ath12k_wifi7_hal_reo_desc_thresh_reached_status()
        ath12k_wifi7_hal_reo_update_rx_reo_queue_status()

However this is not the case for QCC2072 of which the TLV is 32 bit.

Refactor above functions to prepare for QCC2072 support, this is done by
removing TLV length assumption and offloading TLV decoding work to a newly
added callback _reo_status_dec_tlv_hdr. This way each chip can register
its own handler hence can do the work accordingly.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823

Signed-off-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20260112-ath12k-support-qcc2072-v2-3-fc8ce1e43969@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>

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