Bluetooth: Remove wake_locks added for BT idle timer

Wakelocks were used to address the issue related to timer
which was not triggered when device was put into suspend
mode.This does not impact the usecases as the link would
be put into sniff mode immediately after the device comes
out of suspend mode.

Change-Id: I648acf32c6ce9bd0d3415ac0e9dcd2250d3fb68d
Signed-off-by: Sumit Bajpai <sbajpai@codeaurora.org>