qcacmn: Support none 4k page size kernel

DP uses multi page allocation for tx/rx descriptor.
ID and offset mask of decriptor is based on 4096 which
couples with Kernel's MMU PAGE_SIZE. This cause trouble
when deploy driver on none-4K page size kernel.
Set qdf_dp_blockmem_size to 4096 so that DP won't
depend on kernel page size.

Change-Id: I17f5c10b394e8709e6b4b153f3dd094cf792787f
CRs-Fixed: 3235246

dp/wifi3.0/dp_tx_desc.h

@@ -49,9 +49,10 @@
  */
 QDF_COMPILE_TIME_ASSERT(dp_tx_desc_size,
 			((sizeof(struct dp_tx_desc_s)) <=
-			 (PAGE_SIZE >> DP_TX_DESC_ID_PAGE_OS)) &&
+			 (DP_BLOCKMEM_SIZE >> DP_TX_DESC_ID_PAGE_OS)) &&
 			((sizeof(struct dp_tx_desc_s)) >
-			 (PAGE_SIZE >> (DP_TX_DESC_ID_PAGE_OS + 1))));
+			 (DP_BLOCKMEM_SIZE >> (DP_TX_DESC_ID_PAGE_OS + 1)))
+		       );
 
 #ifdef QCA_LL_TX_FLOW_CONTROL_V2
 #define TX_DESC_LOCK_CREATE(lock)