bnxt_en: Pad TX packets below 52 bytes.

The hardware has a limitation that it won't pass host to BMC loopback
packets below 52-bytes.
Signed-off-by: NMichael Chan <michael.chan@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -413,7 +413,7 @@ struct rx_tpa_end_cmp_ext {
 
 #define BNXT_RX_PAGE_SIZE (1 << BNXT_RX_PAGE_SHIFT)
 
-#define BNXT_MIN_PKT_SIZE	45
+#define BNXT_MIN_PKT_SIZE	52
 
 #define BNXT_NUM_TESTS(bp)	0