BaseTools: Fixed a bug in Vpd handling

BaseTools: Fixed a bug in Vpd handling

If there are multiple sku used in a platform and
gEfiMdeModulePkgTokenSpaceGuid.PcdNvStoreDefaultValueBuffer PCD
is used, build will fail.

This is a regression issue introduced by the commit:
5695877ec8f636bd4ad873ef50eceb9da7a0f382 which only update the
Vpd offset for default SKU but not other SKUs.

This patch is going to fix this issue.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>