mb/google/zork: Fix missing comma in CFR object list

When CFR support was added in commit c1f0be39da ("mb/google/zork:
Add CFR option menu support"), a comma was inadvertently left off
the end the first CFR object in the list, which breaks compilation.
Fix this by adding the missing comma.

TEST=build/boot zork

Change-Id: I5f13d87cbc81f440b0c14d253a6334adab45631e
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90732
Reviewed-by: Alicja Michalska <ahplka19@gmail.com>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/zork/cfr.c

@@ -7,7 +7,7 @@
 static struct sm_obj_form ec = {
 	.ui_name = "ChromeEC Embedded Controller",
 	.obj_list = (const struct sm_object *[]) {
-		&auto_fan_control
+		&auto_fan_control,
 		&ec_kb_backlight,
 		NULL
 	},