Instead of having to supply CAR memory region during compilation
time it is possible to determine it in runtime. FSP2.0 blobs carry
a copy of UPD structure pre-populated with 'default' values. The
default value for StackSize is actually the real value blob needs.
Change-Id: I298e07bb12470ce659f63846ab096189138e594f
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/14001
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>