qcacmn: Update number of chips in MLO

To support MLO on 4 chips, update the maximum number of chips that
can participate in MLO to 4.

CRs-Fixed: 3314581
Change-Id: I93a253b4e54f7e4e19ea8407facfb69e6347d192

wlan_cfg/wlan_cfg.h

@@ -100,7 +100,7 @@
 
 /* Max number of chips that can participate in MLO */
 #if defined(WLAN_FEATURE_11BE_MLO) && defined(WLAN_MLO_MULTI_CHIP)
-#define WLAN_MAX_MLO_CHIPS 3
+#define WLAN_MAX_MLO_CHIPS 4
 #define WLAN_MAX_MLO_LINKS_PER_SOC 2
 #else
 #define WLAN_MAX_MLO_CHIPS 1