coreboot_util: use enter to exit bootorder menu

Allow use of enter key for easier flow of execution
Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>

coreboot_util.sh

@@ -552,7 +552,7 @@ create_bootorder_file () {
         clear
         echo "Adjust the default order in which devices will attempt booting."
         echo "Selecting an item will move it to the top of the list."
-        echo "Press 'c' to continue when done."
+        echo "Press [Enter] to continue when done."
         echo ""
         for ((i=0; i <= $((${#options[@]} - 1)); ++i))
         do
@@ -563,6 +563,7 @@ create_bootorder_file () {
         echo "** select a different boot device by pressing 'ESC' at boot time."
         echo ""
         read -r -p "Enter your choice: " bootorder
+        [[ "$bootorder" == "" ]] && bootorder="c"
         case $bootorder in
             1)
                 # already at top, nothing to do