BaseTools: Collect DynamicHii PCD values and assign it to VPD PCD Value

BaseTools: Collect DynamicHii PCD values and assign it to VPD PCD Value

https://bugzilla.tianocore.org/show_bug.cgi?id=661
Collect all DynamicHii and DynamicExHii PCD value into PCD
PcdNvStoreDefaultValueBuffer, then firmware can access this PCD value
to get the variable default setting.

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