wifi: ath12k: fix uninitialize symbol error on ath12k_peer_assoc_h_he()

Smatch throws following errors

drivers/net/wireless/ath/ath12k/mac.c:1922 ath12k_peer_assoc_h_he() error: uninitialized symbol 'rx_mcs_80'.
drivers/net/wireless/ath/ath12k/mac.c:1922 ath12k_peer_assoc_h_he() error: uninitialized symbol 'rx_mcs_160'.
drivers/net/wireless/ath/ath12k/mac.c:1924 ath12k_peer_assoc_h_he() error: uninitialized symbol 'rx_mcs_80'.

In ath12k_peer_assoc_h_he() rx_mcs_80 and rx_mcs_160 variables
remain uninitialized in the following conditions:
1. Whenever the value of mcs_80 become equal to
   IEEE80211_HE_MCS_NOT_SUPPORTED then rx_mcs_80 remains uninitialized.
2. Whenever phy capability is not supported 160 channel width and
   value of mcs_160 become equal to IEEE80211_HE_MCS_NOT_SUPPORTED
   then rx_mcs_160 remains uninitialized.

Initialize these variables during declaration.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.1.1-00188-QCAHKSWPL_SILICONZ-1
Signed-off-by: Aaradhana Sahu <quic_aarasahu@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://patch.msgid.link/20240611031017.297927-3-quic_aarasahu@quicinc.com

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

@@ -2050,7 +2050,9 @@ static void ath12k_peer_assoc_h_he(struct ath12k *ar,
 {
 	const struct ieee80211_sta_he_cap *he_cap = &sta->deflink.he_cap;
 	int i;
-	u8 ampdu_factor, rx_mcs_80, rx_mcs_160, max_nss;
+	u8 ampdu_factor, max_nss;
+	u8 rx_mcs_80 = IEEE80211_HE_MCS_NOT_SUPPORTED;
+	u8 rx_mcs_160 = IEEE80211_HE_MCS_NOT_SUPPORTED;
 	u16 mcs_160_map, mcs_80_map;
 	bool support_160;
 	u16 v;