[ARM PATCH] 2084/1: PXA SSP, I2S and other misc register defs

Patch from Liam Girdwood

Adds some PXA register and bit definitions:-
  o SSP ports
  o I2S
  o AC97_SYSCLK (Mainstone)
  o I2C Alternate function and direction
  o ASSP and NSSP Clock enables

Signed-off-by: Liam Girdwood