Fix deadlock in cuttlefish/default implementation

Bug: 150830099

Test: atest LocationManagerFineTest#testRegisterGnssMeasurementsCallback
-c --iterations 100

Change-Id: I70aec19a481781d924ed3008765ca624a7eeb950
Merged-In: I70aec19a481781d924ed3008765ca624a7eeb950

(cherry picked from commit 3d652709ed40f8070c990bb275d3709d603d318e)
6 files changed