wifi: ath12k: Remove unused ath12k_base from ath12k_hw

Currently, device (ab) reference in hardware abstraction (ah)
is not used anywhere. Also, with multiple device group abstraction,
hardware abstraction would be coupled with device group abstraction
rather than single device.

Hence, remove the ab reference from hardware abstraction.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
Signed-off-by: Harshitha Prem <quic_hprem@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240529060939.4156281-1-quic_hprem@quicinc.com

drivers/net/wireless/ath/ath12k/core.h

@@ -630,8 +630,6 @@ struct ath12k {
 
 struct ath12k_hw {
 	struct ieee80211_hw *hw;
-	struct ath12k_base *ab;
-
 	/* Protect the write operation of the hardware state ath12k_hw::state
 	 * between hardware start<=>reconfigure<=>stop transitions.
 	 */

drivers/net/wireless/ath/ath12k/mac.c

@@ -9254,7 +9254,6 @@ static struct ath12k_hw *ath12k_mac_hw_allocate(struct ath12k_base *ab,
 
 	ah = ath12k_hw_to_ah(hw);
 	ah->hw = hw;
-	ah->ab = ab;
 	ah->num_radio = num_pdev_map;
 
 	mutex_init(&ah->hw_mutex);