staging: r8188eu: remove three unused receive defines

Remove three unused defines from rtl8188e_recv.h.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220315205041.2714168-3-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/rtl8188e_recv.h

@@ -6,10 +6,6 @@
 
 #define TX_RPT1_PKT_LEN 8
 
-#define RECV_BLK_SZ 512
-#define RECV_BLK_CNT 16
-#define RECV_BLK_TH RECV_BLK_CNT
-
 #define NR_PREALLOC_RECV_SKB (8)
 
 #define NR_RECVBUFF (4)