dragon: DragonKeyboardFirmwareUpdater: Exclude the service other than the primary user

This CL add a check to exclude the users other than the current user from
invoking update service.

Bug: 25831955
TEST= build and check if the update notification pop up on the work profile

Change-Id: Id40be6b6acc9915a5b70b3e26e4a76c26e48fa2b
1 file changed