imx: ventana: display 'none' for MMC if board does not have it

print 'None' instead of just a blank line if nothing is detected:
MMC:  None

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/board/gateworks/gw_ventana/common.c b/board/gateworks/gw_ventana/common.c
index adbc679..c07eb62 100644
--- a/board/gateworks/gw_ventana/common.c
+++ b/board/gateworks/gw_ventana/common.c
@@ -1758,6 +1758,7 @@
 		return fsl_esdhc_initialize(bis, &usdhc_cfg[0]);
 	default:
 		/* doesn't have MMC */
+		printf("None");
 		return -1;
 	}
 }