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Use TI-SCI messages to request core start from system controller
firmware.
Signed-off-by: Andrew F. Davis <afd@ti.com>

To wake a core from wfi interrupts must be enabled, in some cases they
may not be and so we can lock up here. Unconditionally enable interrupts
before wfi and then restore interrupt state.
Signed-off-by: Andrew F. Davis <afd@ti.com>

These functions are used for the PSCI implementation and are needed to
build BL31, but we cannot implement them until we add several more drivers
related to ti-sci so these are only stubs for now.
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Benjamin Fair <b-fair@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>