ArmPlatformPkg: PrePei Cache disable and invalidate.

- Disable data cache on all cores.
- Do not clean caches as there might be junk in them, invalidate only.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14527 6f19259b-4bc3-4df7-8a09-765794883524