P9-XIP image build: initial implementation

This code is supposed to be used for all P9-XIP image build flows,
including the ones for the Hardware Image (former Reference Image)
and for the SBE IPL Image (located in the ppe repository).

It has been derived from SBE-XIP code within the ppe repo
(tools/image, sbe/image).

This code has been succesfully used to build the SBE IPL image
in the ppe repository.

This code should is capable of building images, while it does
not come with support for putting default values into
attributes yet.

Changes include:
- cut down on number of included header files
  (eliminating lots of dependencies related to ppe and ekb repos)
- a lot of renaming (SBE to P9-XIP)
- Makefile cleanup
- cleanup of white space damage

Todos:
- Some files might need to be revisited later,
  i.e. anything that doesn't come with a p9_xip_ prefix.
- We may want to integrate this into ekb build.
- The Makefile contains a check for the required compiler version.
  If the checks fails, manual actions must be taken.
  For a fully automated build this needs improvement.
- The P9-XIP image build code needs to be mirrored to the ppe repo,
  and the SBE IPL Image build flow should be adapted to used it.
- The sbe_default_tool is not included in this port.

Change-Id: Ia44474a9a6eab01f7a15b28686644714161d3833
Original-Change-Id: I6017602fc61787fbb58673bfc2bf046f19526ff4
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/23004
Tested-by: Jenkins Server
Reviewed-by: Martin Peschke <mpeschke@de.ibm.com>
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/24286
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

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