Allow vendor_init to set service.adb.tcp.port

adbd and apps (SystemUI and CTS test apps) need to read it.

BUG: 162205386
Test: Connect to device which sets service.adb.tcp.port in vendor
      partition through TCP adb.

Change-Id: Ia37dd0dd3239381feb2a4484179a0c7847166b29
5 files changed