HID: Reduce poll time to 50 ms for polling from uhid driver

HID: Reduce poll time to 50 ms for polling from uhid driver

This patch reduces poll time for data received from uhid driver to 50 ms
from existing 500 ms. Without this change bta thread was getting blocked upto
max 500 ms when HID is disconnected, which caused delay in sending
of AVDTP Media packets during A2DP and HID concurrent test cases resulting
in audio break on BT headset during HID disconnection as closing of uhid
polling thread is done from BTA context.

Change-Id: I033e2d81e895831555bbfdff1f93fad5f2cc5e59