remove: --uboot option, redirect too --dtb

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

mk_mmc.sh

@@ -1414,8 +1414,15 @@ check_mmc () {
 }
 
 uboot_dtb_error () {
-		echo "OR: new: --dtb (device tree)"
 
+	if [ "${tried_uboot}" ] ; then
+		echo "-----------------------------"
+		echo "[--uboot <board>] has been replaced by [--dtb <board>]"
+		echo "see the list below..."
+		echo "-----------------------------"
+	fi
+
+	echo "--dtb (device tree) options..."
 	cat <<-__EOF__
 		-----------------------------
 		ERROR: This script does not currently recognize the selected: [--dtb ${dtb_board}] option..
@@ -1851,7 +1858,9 @@ while [ ! -z "$1" ] ; do
 	--uboot)
 		checkparm $2
 		UBOOT_TYPE="$2"
-		check_uboot_type
+		unset dtb_board
+		tried_uboot=1
+		check_dtb_board
 		;;
 	--dtb)
 		checkparm $2