pcmcia: sa11x0: fix missing clk_put() in sa11x0 socket drivers

Fix the lack of clk_put() in sa11xx_base.c's error cleanup paths by
converting the driver to the devm_* API.

Fixes: 86d88bfc ("ARM: 8247/2: pcmcia: sa1100: make use of device clock")
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>