clocksource: arm_arch_timer: Set arch_mem_timer cpumask to cpu_possible_mask

Currently, arch_mem_timer cpumask is set to cpu_all_mask which should be
fine. However, cpu_possible_mask is more accurate and if there are other
clockevent source in the system which are set to cpu_possible_mask, then
having cpu_all_mask may result in issue.

E.g. on a platform with arm,sp804 timer with rating 300 and
cpu_possible_mask and this arch_mem_timer timer with rating 400 and
cpu_all_mask, tick_check_preferred may choose both preferred as the
cpumasks are not equal though they must be.

This issue was root caused incorrectly initially and a fix was merged as
commit 1332a9055801 ("tick: Prefer a lower rating device only if it's CPU
local device").

Signed-off-by: Sudeep Holla <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Kevin Hilman <[email protected]>
Tested-by: Martin Blumenstingl <[email protected]>
Cc: [email protected]
Cc: Marc Zyngier <[email protected]>
Cc: Mark Rutland <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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