overrideConfig API did not notify platform correctly

In the case when overrideConfig was being passed null
to remove any overrides, it was not notifying the system
of the change.

Bug: 131614858
Test: atest GtsTelephonyTestCases
Change-Id: I7e0342c5b2edb9c3f4b0547c424233a4f73733f2
1 file changed