qcacmn: Update number of chips supported for MLO

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

CRs-Fixed: 3426681
Change-Id: I1281eed9720d5a5f17bbb6a5e3c7f9e56842a33f

dp/wifi3.0/be/mlo/dp_mlo.h

@@ -26,7 +26,7 @@
 #define DP_MAX_MLO_PEER 512
 
 /* Max number of chips supported */
-#define DP_MLO_MAX_DEST_CHIP_ID 3
+#define DP_MLO_MAX_DEST_CHIP_ID 4
 
 /*
  * NB: intentionally not using kernel-doc comment because the kernel-doc