Unify interrupt return paths from TSP into the TSPD
The TSP is expected to pass control back to EL3 if it gets preempted due to an interrupt while handling a Standard SMC in the following scenarios: 1. An FIQ preempts Standard SMC execution and that FIQ is not a TSP Secure timer interrupt or is preempted by a higher priority interrupt by the time the TSP acknowledges it. In this case, the TSP issues an SMC with the ID as `TSP_EL3_FIQ`. Currently this case is never expected to happen as only the TSP Secure Timer is expected to generate FIQ. 2. An IRQ preempts Standard SMC execution and in this case the TSP issues an SMC with the ID as `TSP_PREEMPTED`. In both the cases, the TSPD hands control back to the normal world and returns returns an error code to the normal world to indicate that the standard SMC it had issued has been preempted but not completed. This patch unifies the handling of these two cases in the TSPD and ensures that the TSP only uses TSP_PREEMPTED instead of separate SMC...
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