SPM: Do not schedule if NSPE was interrupted by SPE

Scheduling should not happen if NSPE was interrupted by SPE, otherwise
the NSPE and SPE would be out of sync on thread context.

Note: Multi-core case does not have this issue.

Change-Id: I58e376e175604c57cfd7d240de8030664ce6b4a7
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
2 files changed