download/coreboot: remove unnecessary bloat

it is not necessary to have help output

similarly, listing all boards in this script is
pointless. why not just run ls -1 on the directory?

resources/scripts/download/coreboot

@@ -30,19 +30,6 @@ cbrevision=""
 cbcfgsdir="resources/coreboot"
 
 main()
-{
-	if [ $# -eq 1 ] && [ "$1" = "--help" ] ; then
-		usage
-		exit 0
-	elif [ $# -eq 1 ] && [ "$1" = "--list-boards" ] ; then
-		list_supported_boards
-		exit 0
-	fi
-
-	fetch_coreboot_trees $@
-}
-
-fetch_coreboot_trees()
 {
 	rm -f ${cbcfgsdir}/*/seen
 
@@ -186,23 +173,4 @@ prepare_new_coreboot_tree()
 	)
 }
 
-usage()
-{
-	progname="./download coreboot"
-	printf "Usage:\n"
-	printf "\t%s\t\t\t# Clone coreboot for all boards\n" "${progname}"
-	printf "\t%s [board [board] ...] # Clone coreboot for given boards\n" \
-			${progname}
-	printf "\t%s --list-boards\t# Prints this help\n" ${progname}
-	printf "\t%s --help\t\t# List supported boards\n" ${progname}
-	printf "\t%s --help\t\t# Prints this help\n" ${progname}
-}
-
-list_supported_boards()
-{
-	for _board in "${cbcfgsdir}/"*; do
-		echo ${_board} | sed 's#${cbcfgsdir}/##'
-	done
-}
-
 main $@