qcacmn: Remove RX_BUFFER_SIZE from dp_rx.h to fix compilation

RX_BUFFER_SIZE macro got introduced by mistake during rebase. The macro
is present in hal_rx.h. Removing the extra macro.

CRs-Fixed: 2382076

Change-Id: Ia66079d6d4543b4e3fd99e9f0c0376353a92aa9c

dp/wifi3.0/dp_rx.h

@@ -56,7 +56,6 @@
 #endif /* QCA_HOST2FW_RXBUF_RING */
 
 #define RX_BUFFER_RESERVATION   0
-#define RX_BUFFER_SIZE 2048
 
 #define DP_PEER_METADATA_PEER_ID_MASK	0x0000ffff
 #define DP_PEER_METADATA_PEER_ID_SHIFT	0