drivers/intel/fsp2_0: Make coreboot FSP stack 16-bytes aligned

- Stack alignment:

  1. FSP functions must be called with the stack 16-bytes aligned
     in x86_64 mode.This is already setup properly with the default
     value of the `mpreferred-stack-boundary' compiler option (4).

  2. The FSP heap buffer supplied by coreboot through the `StackBase'
     UPD must be 16-bytes aligned. This alignment is consistent for
     both x86_64 and x86_32 modes to simplify the implementation.

BUG=b:329034258
TEST=Verified on Meteor Lake board (Rex)

Change-Id: I86048c5d3623a29f17a5e492cd67568e4844589c
Signed-off-by: Appukuttan V K <appukuttan.vk@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81661
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Krishna P Bhat D <krishna.p.bhat.d@intel.com>

0 files changed, 0 insertions, 0 deletions