This patch adds support for PowerNV platform.
This patch adds support for PowerNV platform.

Code update procedure in both pSeries and PowerNV platform is same.
But return codes and interface to pass image to kernel differs. Also
in PowerNV by default inband code update is allowed. Hence I have
introduced new file (update_flash_nv) rather than updating existing
update_flash command.

Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>

kamalesh-babulal/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils,tyreld/powerpc-utils,tyreld/powerpc-utils,leitao/powerpc-ibm-utils-debian,leitao/powerpc-ibm-utils-debian,mdroth/powerpc-utils,kamalesh-babulal/powerpc-utils,mdroth/powerpc-utils,tyreld/powerpc-utils,kamalesh-babulal/powerpc-utils,leitao/powerpc-ibm-utils-debian,mdroth/powerpc-utils