qcacmn: Remove void pointer usage for ring desc's

Make change to remove usage of void pointers for
ring descriptors and instead use a opaque pointer
dp_ring_desc_t.

Change-Id: Ia1e9a3da9eaa3cccf297b2135b52a72f2fe21431
CRs-Fixed: 2484409

hal/wifi3.0/hal_internal.h

@@ -172,6 +172,13 @@ enum hal_srng_dir {
 #define SRNG_LOCK_DESTROY(_lock) qdf_spinlock_destroy(_lock)
 
 struct hal_soc;
+
+/**
+ * hal_ring_desc - opaque handle for DP ring descriptor
+ */
+struct hal_ring_desc;
+typedef struct hal_ring_desc *hal_ring_desc_t;
+
 #define MAX_SRNG_REG_GROUPS 2
 
 /* Common SRNG ring structure for source and destination rings */