submodules: add FSP mirror as non-default submodule

Like the 3rdparty/blobs repo this isn't checked out by default. Right
now you can manually check it out using

    $ git submodule init --checkout

A follow up commit will add some automagic if USE_BLOBS and
MAINBOARD_USES_FSP2_0 are enabled.

Change-Id: Ie612495abc2a2d5947225e6ab54872aa72d4bec6
Signed-off-by: Patrick Georgi <>
Reviewed-by: Paul Menzel <>
Reviewed-by: Stefan Reinauer <>
Tested-by: build bot (Jenkins) <>
2 files changed