input: sensors: remove override of sensor poll delay

remove override of sensor poll delay by max_report_latency.
max report latency can be less then poll delay (including zero),
in which case batching mode will be disabled and sensor events
must be reported as soon as they are measured.

Change-Id: Ie72b69c726eab96eaf9fe53e274ff5a4c43a325c
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>