bnx2x: Use fallthrough pseudo-keyword

Replace /* no break */ comments with the new pseudo-keyword macro
fallthrough[1].

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-throughSigned-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c

@@ -6313,11 +6313,11 @@ static void bnx2x_init_internal(struct bnx2x *bp, u32 load_code)
 	case FW_MSG_CODE_DRV_LOAD_COMMON:
 	case FW_MSG_CODE_DRV_LOAD_COMMON_CHIP:
 		bnx2x_init_internal_common(bp);
-		/* no break */
+		fallthrough;
 
 	case FW_MSG_CODE_DRV_LOAD_PORT:
 		/* nothing to do */
-		/* no break */
+		fallthrough;
 
 	case FW_MSG_CODE_DRV_LOAD_FUNCTION:
 		/* internal memory per function is