Allow vendor_init to set service.adb.tcp.port

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

BUG: 162205386
BUG: 183177056
Test: Connect to device which sets service.adb.tcp.port in vendor
      partition through TCP adb.

Change-Id: Ia37dd0dd3239381feb2a4484179a0c7847166b29
Merged-In: Ia37dd0dd3239381feb2a4484179a0c7847166b29
(cherry picked from commit 67c3688497766fe9e5a2cfb8b9eb437a31a6f787)
(cherry picked from commit 9271a3ee8aa4174a78c681e79883627bce918b4a)
10 files changed