FM: driver clean-up

FM: driver clean-up

BZ: 26486

This patch adresses some formatting issues in vanilla TI FM driver.

- Remove magic numbers when possible
- Remove C99 style comments
- Rename poorly named defines

Change-Id: I22249c3b4f4e99521b486d7e6fdec644a85860fe
Signed-off-by: Fabien Peix <fabienx.peix@intel.com>
Reviewed-on: http://android.intel.com:8080/37728
Reviewed-by: Suet, Nicolas <nicolas.suet@intel.com>
Reviewed-by: De Cesco, Jonathan <jonathan.de.cesco@intel.com>
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Tested-by: Zurmely, PierreX <pierrex.zurmely@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>