[ARM] 5154/1: PalmTX PCMCIA

This patch adds PCMCIA support for PalmTX handheld computer.
There is one chip hard-soldered to slot0, another slot is
not in use and not accessible.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>