futility: updater: explain that match-name quirks are now deprecated

The 'match by firmware name' should be deprecated. All new platforms
should use quirk instruction files (updater_quirks) from CBFS.

BUG=None
TEST=None (comments only)
BRANCH=None

Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Change-Id: Ib66cc903b15bf3fdb44db832a010d80c40bfbaa4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3458024
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-by: Karthikeyan Ramasubramanian <kramasub@google.com>
diff --git a/futility/updater_quirks.c b/futility/updater_quirks.c
index 7a49350..c8140c1 100644
--- a/futility/updater_quirks.c
+++ b/futility/updater_quirks.c
@@ -21,6 +21,14 @@
 	const char * const quirks;
 };
 
+/*
+ * The 'match by firmware name' is now deprecated. Please do not add any
+ * new records below. We now support reading quirks from CBFS, which is
+ * easier and more reliable. To do that, create a text file 'updater_quirks'
+ * and install to the CBFS.
+ *
+ * Examples: CL:*3365287, CL:*3351831, CL:*4441527
+ */
 static const struct quirks_record quirks_records[] = {
 	{ .match = "Google_Whirlwind.", .quirks = "enlarge_image" },
 	{ .match = "Google_Arkham.", .quirks = "enlarge_image" },