Merge "feat(firme): initial commit of FIRME service" into integration

feat(firme): initial commit of FIRME service

This is the first FIRME service patch that adds support for basic ABIs
for retrieving the FIRME version, features, and GPI_SET.

This adds a new generic

feat(firme): initial commit of FIRME service

This is the first FIRME service patch that adds support for basic ABIs
for retrieving the FIRME version, features, and GPI_SET.

This adds a new generic granule transition function that replaces
the existing delegate/undelegate APIs that GPI_SET uses. It also
updates TRP to use GPI_SET when FIRME is supported.

FIRME spec is here, note that it is ALPHA2 quality so further changes
are to be expected:
https://developer.arm.com/documentation/den0149

Change-Id: I57b8ad7e87a0679e15c8247f8457f91f3254dedb
Signed-off-by: John Powell <john.powell@arm.com>
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>

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