arm64: Select POSIX_CPU_TIMERS_TASK_WORK

With 6caa5812e2d1 ("KVM: arm64: Use generic KVM xfer to guest work
function") all arm64 exit paths are properly equipped to handle the
POSIX timers' task work.

Deferring timer callbacks to thread context, not only limits the amount
of time spent in hard interrupt context, but is a safer
implementation[1], and will allow PREEMPT_RT setups to use KVM[2].

So let's enable POSIX_CPU_TIMERS_TASK_WORK on arm64.

[1] https://lore.kernel.org/all/[email protected]/
[2] https://lore.kernel.org/linux-rt-users/87v92bdnlx.ffs@tglx/

Signed-off-by: Nicolas Saenz Julienne <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Acked-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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