1. Check variable offset when merging Hii Pcds
2. Fixed the issue of Hii value inherit with default store.
3. Error handling for incorrect structure pcd declare.
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>