sensor: Reintroduce guarded scmi_senosr header inclusion

Merged Darryl Green requested to merge github/fork/nicola-mazzucato-arm/sensor_6e15118 into master

Created by: nicola-mazzucato-arm

Previous commit 989816611 removed the scmi_sensor header inclusion, but that breaks the build when SENSOR_EVENTS are selected. Reintroduce the header but this time guarded by its build definition.

Change-Id: I1200d78bafa84329a35e61f222cfde45f490053d Signed-off-by: Nicola Mazzucato

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