ANDROID: irqchip/irq-gic-v3: Add vendor hook for gic suspend

This change adds vendor hook for gic suspend syscore ops callback.
And it is invoked during deepsleep and hibernation to store
gic register snapshot.

On upstream, currently gic_suspend is not used for
hibernation and deepsleep. This is added here to support deepsleep.

RFC patch https://lore.kernel.org/lkml/1652860121-24092-4-git-send-email-quic_vivekuma@quicinc.com/T/#r89b1845240646318fdcd69b20afa02680ab128f5

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Bug: 279879797
Change-Id: I4e3729afa4daf18d73e00ee9601b6da72a578b4a
Signed-off-by: Nagireddy Annem <quic_nannem@quicinc.com>
Signed-off-by: Shreyas K K <quic_shrekk@quicinc.com>