[ARM] 5427/1: h3600: ipaq_model_ops final cleanup

Since now ipaq_model_ops used only for accessing h3600 EGPIOs,
drop it completely and use assign_h3600_egpio() directly.

Signed-off-by: Dmitry Artamonow <mad_soft@inbox.ru>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>