New FAPI2 interfaces to read and write MMIO ranges
New FAPI2 interfaces to read and write MMIO ranges

Adding 2 new fapi2 interfaces for platforms to implement:
- getMMIO
- putMMIO

These functions will read/write a data buffer into a known
memory-mapped i/o space based on an address that is relative
to the input target.

Change-Id: Iac7d97f221469d0be89d719df20aef51794725b0
Original-Change-Id: Id24888e355cccfd462a57868eabc2af7cebd4ed4
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/65037
Reviewed-by: Benjamin Gass <d33fb9b956fd4e7c201de67e681adf83a89c45b0@us.ibm.com>
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Reviewed-by: Matt K. Light <19ba8ed73a0b3c376c81fced381f1ac0f483b7c2@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <7301c4b00f53e5772c2576cd0c5f485155c2ece1@us.ibm.com>
Reviewed-by: ANDRE A. MARIN <65293609e29ccd0ac899f5f3f03aea95be1b215f@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <ab93eca12e43608f33daa16a67357cd7b7e867ab@us.ibm.com>

open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot