Read by UUID for PTS tests (3/5)

Add a hidden api for reading characteristic by UUID for PTS.

Bug: 35150313
Test: sl4a GattReadTest.byUuid
Change-Id: Ia429895abf38b504975af5d53ec4c5adf5a01a9d
(cherry picked from commit f6833f45c39e1ffd41b2183bfcfcceaf1e6bacdc)
1 file changed