Race condition in opening/closing of uhid file descriptor

When HID host is connected, uhid file descriptor is opened from bta_hh
in main thread. However, when it is disconnected, uhid file descriptor
is closed from btif_hh in jni thread.
If the HID device gets disconnected and connected in quick succession,
the race condition can cause connection to fail.

Bug: 264988156
Test: Manual
Change-Id: I9ff6196eeebdd0a1dd5245f29a174c4b28dbe1b6