Limit max frequency to 400Hz
Limit max frequency to 400Hz

It seems that having the accel and the gyro work at very high
frequencies (> 500) at the same time does not go very well with the
overall cpu loading and can affect other threads, for example the magnetometer
events don't come as fast as cts would like it given these conditions.

Tracked-On: https://jira01.devtools.intel.com/browse/GMINL-2227
Change-Id: I69480b393794afb072654451a468c30bb821466a
Signed-off-by: Adriana Reus <54192c763ae4f960dbf2b2f913f2990b3167a436@intel.com>

01org/android-iio-sensors-hal,01org/android-iio-sensors-hal