purism/librem13v2: migrate from FSP 1.1 to 2.0

Migrate the Librem13v2 from using FSP 1.1 to
the public/GitHub FSP 2.0 Skylake/Kabylake release:

- select FSP 2.0 in Kconfig
- adjust romstage/ramstage functions as required
- refactor pei_data functions
- remove VR_RING domain from devicetree (unsupported in FSP 2.0)
- add SataSpeedLimit parameter to work around power-related issue
  when operating at SATA 6.0Gbps speed

TEST: build/boot Librem13v2, observe successful boot, lack of
SATA-related errors in dmesg.

Change-Id: Iedcc18d7279409ccd36deb0001567b0aa5197adf
Signed-off-by: Youness Alaoui <youness.alaoui@puri.sm>
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/22046
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Youness Alaoui <snifikino@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
6 files changed