samsung: misc: add env default option to lcd menu

This change allows reset device environment to default without using u-boot
console, which is useful for system developers.

Signed-off-by: Inha Song <ideal.song@samsung.com>
Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/include/samsung/misc.h b/include/samsung/misc.h
index c3d844b..10653a1 100644
--- a/include/samsung/misc.h
+++ b/include/samsung/misc.h
@@ -16,6 +16,7 @@
 	BOOT_MODE_UMS,
 	BOOT_MODE_DFU,
 	BOOT_MODE_GPT,
+	BOOT_MODE_ENV,
 	BOOT_MODE_EXIT,
 };