arm64: smp: Add wakeup IPI support
Add support for IPI_WAKEUP which is used by hotplug code
path to wake up CPU from low power states.
Change-Id: I258d05e109a377613064624a5bfda21ab8ea9869
Signed-off-by:
Abhimanyu Kapur <abhimany@codeaurora.org>
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