Vlv2TbltDevicePkg/PlatformInitPei: Workaround unaligned SMRAM size

Vlv2TbltDevicePkg/PlatformInitPei: Workaround unaligned SMRAM size

https://bugzilla.tianocore.org/show_bug.cgi?id=260

The PiSmmCPuDxeSmm module requires the SMRR base address and length
to be aligned.  The memory initialization for Vlv2TbltDevicePkg
produces an SMRAM base address that is on a 16MB boundary and an
SMRAM length of 12MB.  The SMRAM length is rounded up to 16MB.

This is a workaround until the binary module that produces the
gEfiSmmPeiSmramMemoryReserveGuid HOB is updated

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: David Wei <david.wei@intel.com>
Cc: Mang Guo <mang.guo@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>