IRDA-1184: Alternate between triggers depending on sampling rate

IRDA-1184: Alternate between triggers depending on sampling rate

The BMC150 accel driver any-motion trigger is too jerky for certain
games such as the "sniper shooter" one, or "doodle jump". Switch back
to continuous event generation mode if a sampling rate above 25 is
requested, which should keep both the launcher (15 events per second)
and games (60 events per second) happy.

Issue: IRDA-1184

Change-Id: I16000d57e17506aa7e7c0a4f83ced7739e01dd01
Signed-off-by: Patrick Porlan <patrick.porlan@intel.com>