[TEMP][EINJ-CMN]feat(einj): EINJ test code for CMN KFH

Add support to validate CMN KFH using CMN PFG registers. This patch adds
following support.
- Memory map entry for CMN device
- Implementation for enable error detection for CMN device nodes.
- Inject CE, DE, UE using the PFG registers in all supported CMN device
nodes.

Signed-off-by: Omkar Anand Kulkarni <omkar.kulkarni@arm.com>
Change-Id: I5a72f78d169d974eb63be25263677e11b0b31f41