USB: android: Reinit pm_qos request to avoid vote on all cores

Commit 8e64c400 ("USB: android: Remove PM QOS request during
cable disconnect") added pm_qos_request_add/remove on CONNECT and
DISCONNECT. PM QOS driver clears request on remove which results in
subsequent pm_qos_add request updating latency on all cores.
Fix this by re-initializing pm_qos request before every pm_qos add.

Change-Id: I0c8063d0f020139c6953c502b83c29bf50a0abef
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>