Moving adbd from rootdir to system/bin

Bug: 63910933
Test: boot sailfish in normal mode, checks adbd is started
Test: boot sailfish in recovery mode, checks adbd is started
Test: boot bullhead in normal mode, checks adbd is started
Test: boot bullhead in recovery mode, checks adbd is started

Change-Id: I35ed78a15a34626fbd3c21d030e2bf51033f7b79
Merged-In: I35ed78a15a34626fbd3c21d030e2bf51033f7b79
(cherry picked from commit e2423d14)