[ARM] 5204/1: Trizeps4 SOM update

- use MFP-API for GPIO
- support TRIZEPS4WL module
- cleanups

Signed-off-by: Jrgen Schindele <linux@schindele.name>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>