ArmPlatformPkg: Give a name to the FV

ArmPlatformPkg: Give a name to the FV

By default, a MemoryMap() EFI Device Path is created
for the Firmware Volumes.
It means it is difficult to build a Non-Volatile permanent
Device Path for the Firmware Volume as the location in
System Memory may change.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <Olivier.Martin@arm.com>
Reviewed-by: Ronald Cron <Ronald.Cron@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17827 6f19259b-4bc3-4df7-8a09-765794883524