edk2: Update to TianoCore Contribution Agreement 1.1

https://bugzilla.tianocore.org/show_bug.cgi?id=629

Update the TianoCore Contribution Agreement from Version 1.0
to Version 1.1 to cover open source documentation associated
with the TianoCore project.

Version 1.0 covers source code files.  Version 1.1 is a
backwards compatible extension that adds support for document
files in both source form and compiled form.

The edk2 repository is updated so the same contribution
agreement is used by developers that work on TianoCore
related source code or TianoCore related documents.

Links to RFC and Wiki on the GitBook documentation process
* https://lists.01.org/pipermail/edk2-devel/2017-March/008654.html
* https://github.com/tianocore-docs/edk2-TemplateSpecification/wiki



Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Andrew Fish <afish@apple.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>