SystemServer: initialize ADB before USB

USB depends on ADB to hold the state for ADB debugging enabled, so move it
to initialize before USB attempts to initialize. This removes a race
condition introduced by moving the source of truth for ADB debugging enabled
to the AdbService instead of UsbService.

Bug: 119765805
Test: boot emulator several times
Change-Id: Ib1f5ae0ceab5abe64e2d14b9e2b3a55c9919ad2f