mb/starlabs/starbook: Add CFR options for power/charge LED brightness

Add CFR options to expose EC controls to set the brightness of the
power and charge LEDs (normal/dim/off).

TEST=build/boot starbook_mtl, verify LED control via CFR

Change-Id: I7e1fe4efaab4327c8b95b108a9014e50058d6ed4
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90564
Reviewed-by: Sean Rhodes <sean@starlabs.systems>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>

src/mainboard/starlabs/starbook/cfr.c

@@ -38,6 +38,8 @@ static struct sm_obj_form power = {
 		#if CONFIG(EC_STARLABS_CHARGING_SPEED)
 		&charging_speed,
 		#endif
+		&power_led,
+		&charge_led,
 		&power_on_after_fail_bool,
 		NULL
 	},