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To support compatibility with previous GICv3 driver version
this patch:
- restores original API for gicr_read_ipriority() and
gicr_wrtite_ipriority() functions;
- adds accessor functions for GICR_XXX0,1 registers, e.g.
GICR_IGROUPR0, GICR_ICFGR0, GICR_ICFGR1, etc.

Change-Id: I796a312a61665ff384e3d9de2f4b3c60f700b43b
Signed-off-by: Alexei Fedorov <Alexei.Fedorov@arm.com>