lbmk: use 2-level directory structure in script/

as opposed to the current 3-level structure.

recent build system simplifications have enabled
this change, thus:

./build fw coreboot -> ./build roms
./build fw grub -> ./build grub
./build fw serprog -> ./build serprog
./update project release -> ./update release
./update project trees -> ./update trees
./update vendor download -> ./vendor download
./update vendor inject -> ./vendor inject

alper criticised that the commands were too long,
so i made them shorter!

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

include/git.sh

@@ -75,7 +75,7 @@ fetch_project_repo()
 
 	clone_project
 	[ "${depend}" = "" ] || for d in ${depend} ; do
-		x_ ./update project trees -f ${d}
+		x_ ./update trees -f ${d}
 	done
 	x_ rm -Rf "${tmp_git_dir}"
 }

include/option.sh

@@ -3,7 +3,7 @@
 # SPDX-FileCopyrightText: 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
 # SPDX-FileCopyrightText: 2023 Leah Rowe <leah@libreboot.org>
 
-vendir="vendor"
+vendir="vendorfiles"
 appdir="${vendir}/app"
 cbdir="src/coreboot/default"
 cbcfgsdir="config/coreboot"
@@ -62,7 +62,7 @@ check_defconfig()
 handle_coreboot_utils()
 {
 	for util in cbfstool ifdtool; do
-		x_ ./update project trees ${_f} "src/coreboot/${1}/util/${util}"
+		x_ ./update trees ${_f} "src/coreboot/${1}/util/${util}"
 		[ -z "${mode}" ] && [ ! -f "cbutils/${1}/${util}" ] && \
 			x_ mkdir -p "cbutils/${1}" && \
 			x_ cp "src/coreboot/${1}/util/${util}/${util}" \