qcacmn: Fix wlan_cfg file inclusion and remove duplicate static API

Due to issues in Kbuild wlan_cfg was included using relative path.
Also getting rid of a duplicate static function definition in
dp_peer.c.

Change-Id: Ie0883340a9143b739119f18c8871b4baa9787980
CRs-Fixed: 2005582

dp/wifi3.0/dp_peer.c

@@ -28,12 +28,7 @@
 #include <cds_ieee80211_common.h>
 #endif
 #include <cdp_txrx_handle.h>
-/* Temporary definitions to be moved to wlan_cfg */
-static inline uint32_t wlan_cfg_max_peer_id(void *wlan_cfg_ctx)
-{
-	/* TODO: This should be calculated based on target capabilities */
-	return 2048;
-}
+#include <wlan_cfg.h>
 
 static inline int dp_peer_find_mac_addr_cmp(
 	union dp_align_mac_addr *mac_addr1,