Synchronize access to sNotificationBundle.

Otherwise Shell can crash due to ConcurrentModificationException

Test: atest BugreportReceiverTest
Test: manual verification

Fixes:116280360

Change-Id: I138acd43b313d2a7a9d945fb44a9d63e1ad798eb
Merged-In: I138acd43b313d2a7a9d945fb44a9d63e1ad798eb
(cherry picked from commit ee72fa19a97f2b0677a130204e3527bc3233e4d9)
1 file changed