ArmPlatformPkg/BootMonFs: Provide mechanism to get BootMonFS file information

ArmPlatformPkg/BootMonFs: Provide mechanism to get BootMonFS file information

Add additional structure to get file meta-data information from BootMonFS
based files. AXF files are processed by the Flash loader and the ELF header
stripped. The relevant information is stored in the file-system.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Harry Liebel <Harry.Liebel@arm.com>
Reviewed-By: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15902 6f19259b-4bc3-4df7-8a09-765794883524