GIC provides implementation specific registers, to configure affinity of a SPI. Update the existing affinity hook to allow vendors to configure those implementation defined settings. Bug: 180471389 Change-Id: I273035da65eaeb346c0d8b303a722f4d8d7918d6 Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org> (cherry picked from commit f52f34358744754df82678e6a0726370fcdbec31) Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>