only user_led2 (blue) is supported.

user_led1 (green) is not connected to any gpio so it cannot be
controlled.
Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Link: https://lore.kernel.org/r/20220908031726.1307105-1-naoki@radxa.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>