ArmPkg/PL390Gic: Fixed setting of the Interrupt Processor Targets Registers when...

ArmPkg/PL390Gic: Fixed setting of the Interrupt Processor Targets Registers when Uniprocessor

When running on a uniprocessor implementation, the ICDIPTRn registers are RAZ (Read as Zero).
So the previous assertion was not correct.

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@14798 6f19259b-4bc3-4df7-8a09-765794883524