ArmPkg/PL390Gic: Populate the GIC Distributor Target Register with the GIC CPU ID...

ArmPkg/PL390Gic: Populate the GIC Distributor Target Register with the GIC CPU ID retrieved from the GIC

The GIC CPU Id (the GIC CPU interface the CPU is connected to) can be retrieved by reading the first
registers of the GIC CPU Target Registers.
The first GIC Distributor Target registers correspond to the SGIs.

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@14479 6f19259b-4bc3-4df7-8a09-765794883524