[PATCH] Update PA-RISC IOMMU code

 - The pdc_io_reset_devices() call necessary for USB keyboard kills the
   serial console.  Use a test that seems to work for both.
 - Don't bounce >4G buffers on machines with IOMMU
 - Remove ASSERT code and cleanup iomem * related warnings
 - Fix comment that was pointing to the old file location
 - Expand comment about PDC reset to describe broken GFX+USB console at
   powerup by direct linux to serial console
 - Fix all ioremap abuse noticed by CONFIG_DEBUG_IOREMAP on an N4000
 - Remove casts from "READ_REG" and "WRITE_REG" macro
 - Set D4 and DD bits in IOC_CTRL
 - Allow all memory in machine to be in-flight DMA at once, up to 4GB
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Matthew Wilcox <willy@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>