build/roms: simplify serprog list command

Signed-off-by: Leah Rowe <leah@libreboot.org>

script/roms

@@ -87,7 +87,7 @@ handle_serprog()
 	x_ mkdir -p "bin/serprog_${1}"
 
 	if [ $# -gt 1 ] && [ "${2}" = "list" ]; then
-		print_serprog_boards ${serprog_boards_dir}
+		list_serprog_boards ${serprog_boards_dir}
 		return 0
 	elif [ $# -gt 1 ]; then
 		build_${1}_rom "${2}"
@@ -125,12 +125,6 @@ build_stm32_rom()
 	printf "output to bin/serprog_stm32/serprog_%s.hex\n" "$board"
 }
 
-print_serprog_boards()
-{
-	printf "Available boards:\n"
-	list_serprog_boards "${1}"
-}
-
 list_serprog_boards()
 {
 	basename -a -s .h "${1}/"*.h || $err "list_boards $1: can't list boards"