mfd: cros_ec: Register LED subdevice

Add ChromeOS EC-based LED control as EC subdevice.

Signed-off-by: Thomas Weißschuh <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/cros_ec_dev.c

···
 	{ .name = "cros-ec-wdt", }
 };
 
+static const struct mfd_cell cros_ec_led_cells[] = {
+	{ .name = "cros-ec-led", },
+};
+
 static const struct cros_feature_to_cells cros_subdevices[] = {
 	{
 		.id		= EC_FEATURE_CEC,
···
 		.id		= EC_FEATURE_HANG_DETECT,
 		.mfd_cells	= cros_ec_wdt_cells,
 		.num_cells	= ARRAY_SIZE(cros_ec_wdt_cells),
+	},
+	{
+		.id		= EC_FEATURE_LED,
+		.mfd_cells	= cros_ec_led_cells,
+		.num_cells	= ARRAY_SIZE(cros_ec_led_cells),
 	},
 };