cmd_mmc.c: Fix typo, "dislay" -> "display"

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
index 62a1c224..4c19df7 100644
--- a/common/cmd_mmc.c
+++ b/common/cmd_mmc.c
@@ -144,7 +144,7 @@
 U_BOOT_CMD(
 	mmcinfo, 1, 0, do_mmcinfo,
 	"display MMC info",
-	"- dislay info of the current MMC device"
+	"- display info of the current MMC device"
 );
 
 static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])