update/project/*: unified patch handling

Handle patches by a function at include/git.sh

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

include/git.sh

@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+# SPDX-FileCopyrightText: 2023 Leah Rowe <leah@libreboot.org>
+
+git_am_patches()
+{
+	sdir="${1}" # assumed to be absolute path
+	patchdir="${2}" # ditto
+	_fail="${3}"
+	(
+	cd "${sdir}" || \
+	    "${_fail}" "apply_patches: !cd \"${sdir}\""
+	for patch in "${patchdir}/"*; do
+		[ -L "${patch}" ] && continue
+		[ -f "${patch}" ] || continue
+		if ! git am "${patch}"; then
+			git am --abort || "${_fail}" "${sdir}: !git am --abort"
+			"${_fail}" "!git am ${patch} -> ${sdir}"
+		fi
+	done
+	)
+}