fw-api: Make CFG_TGT_NUM_MSDU_DESC configurable through driver config

Make CFG_TGT_NUM_MSDU_DESC configurable through driver config.

Change-Id: If9cec901c82dc1718cffb81a213f57aaa6c36ea0
CRs-Fixed: 2401756

fw/wlan_tgt_def_config_hl.h

@@ -212,10 +212,8 @@
 /*
  * total number of descriptors to use in the target
  */
-#ifndef HIF_SDIO
+#ifndef CFG_TGT_NUM_MSDU_DESC
 #define CFG_TGT_NUM_MSDU_DESC    (32)
-#else
-#define CFG_TGT_NUM_MSDU_DESC    (0)
 #endif
 /*
  * Maximum number of frag table entries