payloads/tianocore: default to MrChromebox's working branch

Rather than attempt to maintain patches against upstream Tianocore, use
MrChromebox's coreboot framebuffer branch as the default build target.

Rework the Makefile to default to MrChromebox's coreboot_fb branch, but
also allow for aribitrary commits from upstream Tianocore to be used
as build targets.

Ensure the branch is synced on each build, as long as working directory
is clean, and that switching between commits or trees is handled sanely.

Eliminate TIANOCORE_MASTER as a selectable build target, since unpatched
it is unlikely to boot on any device. It can easily be specified via
the 'revision' option if desired.

Test: build for the default stable target, for upstream/master
as the specified revision, and for an arbitrary valid commit hash.

Change-Id: I4a83db3cd64c7d5b652c6e95780d10051f143e88
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/31543
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

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