Let adbd set service.adb.tcp.port.

Commit 67c36884 changed the label of service.adb.tcp.port to allow
vendor init to set it, but accidentally prevented adbd from setting it,
which broke `adb tcpip`.

Bug: 171280882
Bug: 183177056
Test: `adb tcpip`
Change-Id: Ifeeda5c4f06451158fc7e43ca23f580092008fe7
Merged-In: Ifeeda5c4f06451158fc7e43ca23f580092008fe7
Merged-In: I154e2f43a4d3b72b27508ce02d66298673939738
(cherry picked from commit 0cac6fd17a341cc64e9aca2e9b402234b08264d8)
(cherry picked from commit f08778d513b69bd9966d04dd1c874b1bede93289)
6 files changed