merge coreboot/u-boot download logic to one script

they are fundamentally the same, in an lbmk context.

they are downloaded in the same way, and compiled in
the same way!

(Kconfig infrastructure, board-specific code, the way
submodules are used in git, etc)

~200 sloc reduction in resources/scripts

the audit begins

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

resources/scripts/build/release/src

@@ -23,13 +23,15 @@ set -u -e
 
 projectname="$(cat projectname)"
 
-modlist="coreboot flashrom grub memtest86plus seabios me_cleaner u-boot"
-modlist="${modlist} bios_extract biosutilities uefitool"
+trees_gitclone_list="coreboot u-boot"
+simple_gitclone_list="flashrom grub memtest86plus seabios me_cleaner uefitool"
+simple_gitclone_list="${simple_gitclone_list} bios_extract biosutilities"
 
 dirlist="resources util" # do not add blobs directory here. it's handled below
 
 filelist="lbmk blobutil modify download build README.md COPYING Makefile update"
 filelist="${filelist} version versiondate projectname .gitcheck gitclone"
+filelist="${filelist} fetch_trees"
 
 version="version-unknown"
 versiondate="version-date-unknown"
@@ -75,16 +77,19 @@ create_release_directory()
 
 download_modules()
 {
-	for modname in ${modlist}; do
-		if [ ! -d "${modname}/" ]; then
-			./download ${modname}
-		fi
+	for modname in ${trees_gitclone_list}; do
+		[ ! -d "${modname}" ] && \
+		    ./fetch_trees ${modname}
+	done
+	for modname in ${simple_gitclone_list}; do
+		[ ! -d "${modname}/" ] && \
+		    ./download ${modname}
 	done
 }
 
 copy_files()
 {
-	for dir in ${modlist} ${dirlist}; do
+	for dir in ${simple_gitclone_list} ${dirlist}; do
 		cp -R "${dir}/" "${srcdir}/"
 	done