Core: Avoid NS execution mask secure PendSV
This patch fixes an issue where NS execution can mask or preempt
the secure PendSV interrupt, by making sure that the priority
number of the secure PendSV is high enough not to be preempted
or masked by the NS execution.
Change-Id: Iab0ff351efc4e45d92fd80538e0594e65d64623a
Signed-off-by:
Ken Liu <ken.liu@arm.com>
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