Fix the frequncy unit mismatch between the FM app and the driver.

This change was part of Sami Masad's change Iec40b6ab, but it has lot of
other changes and that has been on hold for some time.

Submitting this seperately as this will fix the tuning issues.
This wont fix the audio routiung issues though.

Change-Id: Ia0333e6d86321b694278eaef045b231baaff9afc