KVM: arm/arm64: vgic: Introduce find_reg_by_id()

In order to implement vGICv3 CPU interface access, we will need to perform
table lookup of system registers. We would need both index_to_params() and
find_reg() exported for that purpose, but instead we export a single
function which combines them both.

Signed-off-by: Pavel Fedin <[email protected]>
Signed-off-by: Vijaya Kumar K <[email protected]>
Reviewed-by: Andre Przywara <[email protected]>
Reviewed-by: Eric Auger <[email protected]>
Acked-by: Christoffer Dall <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>

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