Staging: Westbridge: added ioremap_nocache instead of phys_to_virt

This patch removes phys_to_virt() and adds ioremap_nocache() for
memory mapping the GPMC registers.

Signed-off-by: Sutharsan Ramamoorthy <srmt@cypress.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>