oh yeah, need it here too

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

mk_mmc.sh

@@ -109,7 +109,7 @@ function is_element_of {
 #
 #########################################################################
 
-VALID_ADDONS="pico ulcd"
+VALID_ADDONS="pico ulcd chalk_elec_lvds"
 
 function is_valid_addon {
 	if is_element_of $1 "${VALID_ADDONS}" ] ; then
@@ -1913,6 +1913,7 @@ if [ -n "${ADDON}" ] ; then
 		echo "Supported --addon options:"
 		echo "    pico"
 		echo "    ulcd <for the beagleboard xm>"
+		echo "    chalk_elec_lvds"
 		exit
 	fi
 fi