[ARM] 5294/1: Trizeps4 PCMCIA support

Support for Trizeps4 SOM PCMCIA
with ConXS or other baseboards.
with double GPIO-free fixed (sorry!)

replaces 5279/1

Signed-off-by: Jurgen Schindele <linux@schindele.name>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>