leds: bcm6328, bcm6358: use devres LED registering function

These two drivers do not provide remove method and use devres for
allocation of other resources, yet they use led_classdev_register
instead of the devres variant, devm_led_classdev_register.

Fix this.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Cc: Álvaro Fernández Rojas <noltari@gmail.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jaedon Shin <jaedon.shin@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Cc: stable@kernel.org