QuarkFspPkg/FspInit: Don't add a memory range when SMM size is 0
QuarkFspPkg/FspInit: Don't add a memory range when SMM size is 0

Don't add an empty memory range when SMM size is zero.  Instead quietly
skip the SMM processing.

Change-Id: Ia3b394d628c3a110ec9624ceed0558739de75ce7
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Lee Leahy <5db40003354dc1c142019712d90bc051b3fe1c17@intel.com>

LeeLeahy/quarkfsp,LeeLeahy/quarkfsp,LeeLeahy/quarkfsp