Add a sample showing the use of the step sensors
(STEP_DETECTOR and STEP_COUNTER) and sensor event batching.

Change-Id: Ied3a2601b09b12a53ddbe709b959776ca9e87c3c
(cherry picked from commit 501ae9a1d88ba4b5c877f4218b75630271c71e3c)
16 files changed