ArmPkg: Retire the unified GIC driver

Now that all platforms that do require GIC v2 support to be retained
have implemented their own logic to dispatch either the v2 version or
the v3+ version, depending on what the platform implements, the unified
version that supports both in a single driver is no longer used.

Delete the driver, and repurpose the ArmGicDxe.inf name by turning it
into an alias of ArmGicV3Dxe.inf. That way, existing platforms that
incorporate ArmGicDxe.inf will lose GICv2 support rather than break
entirely (which is unlikely to make a difference in most cases), and
going forward, the confusing V3 naming (considering the fact that the V3
driver supports v4 and v5 as well) can be phased out as well.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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