libhardware: Add power hint to set profile

 * A PowerHAL can implement support for this hint to receive
   power profile changes from the framework.

Change-Id: Ie1e9e3b827c731cf5a817a0491677e3451fe8678
Merge pull request #1 from CyanogenMod/cm-11.0

libhardware: Add power hint to set profile
Merge pull request #1 from XperiaSTE/cm-11.0

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