MdeModulePkg: Update PeiCore to handle specific child FV

MdeModulePkg: Update PeiCore to handle specific child FV

Child FV may be placed in parent FV image without process required. Then,
Child FV and parent FV will be in the same continuous space. For FileHandle,
FileHandleToVolume() function needs to find the best matched FV handle.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17704 6f19259b-4bc3-4df7-8a09-765794883524