mfd: cgbc: Add support for HWMON

The Board Controller has some internal sensors. Add a hwmon cell for the
cgbc-hwmon driver which adds support for temperature, voltage, current
and fan sensors.

Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
Link: https://lore.kernel.org/r/20250203-congatec-board-controller-hwmon-v4-2-ff6c76a4662c@bootlin.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: thom24

drivers/mfd/cgbc-core.c

@@ -236,6 +236,7 @@ static struct mfd_cell cgbc_devs[] = {
 	{ .name = "cgbc-gpio"	},
 	{ .name = "cgbc-i2c", .id = 1 },
 	{ .name = "cgbc-i2c", .id = 2 },
+	{ .name = "cgbc-hwmon"	},
 };
 
 static int cgbc_map(struct cgbc_device_data *cgbc)