mfd: cros_ec: Register hardware monitoring subdevice

Add ChromeOS EC-based hardware monitoring 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

···
 static const struct mfd_cell cros_ec_platform_cells[] = {
 	{ .name = "cros-ec-chardev", },
 	{ .name = "cros-ec-debugfs", },
+	{ .name = "cros-ec-hwmon", },
 	{ .name = "cros-ec-sysfs", },
 };