ArmPkg ArmPlatformPkg ArmVirtPkg: ARM GICv2/v3 Base Address width fix-up

ArmPkg ArmPlatformPkg ArmVirtPkg: ARM GICv2/v3 Base Address width fix-up

According to the ACPI 6.0/6.1 spec, the physical base address of GICC,
GICD, GICR and GIC ITS is 64-bit. So change the type of the various GIC
base address PCDs to 64-bit, and fix up all users.

Contributed-under: TianoCore Contribution Agreement 1.0
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Dennis Chen <dennis.chen@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>