Use the ?= operator so BT properties can be overridden

System properties set with the "=" operator cannot be overriden. This
device is used elsewhere in the system and some of the properties need
to be overridden. The "?=" operator will use the assigned value if no
other values are assigned elsewhere, allowing for overrides.

Bug: 230638462
Test: adb shell getprop | grep bluetooth
Change-Id: I0e33816b9d2572d26ddd2ee8b623e0c1733accd0
1 file changed