Fix sluggish HID devices

Right now, when connecting to HID devices, preferred connection
parameters are not being used. This is because of bug in GAP profile.
This make all HID devices use default connection parameters, which
mean that they behave sluggish. This patch fixes that by forcing
HID devices to re-read connection parameters on each reconnection.

This is a temporary workaround until GAP is rewritten.

Change-Id: I74b70ad8e96c29517cace808632fe4d8e0251994