Revert "msm8974: Move wcnss-service to main class"

This reverts commit d3e35844b3b499582383b69937d482eb088408dc.

This fixed BACON-1293. The wcnss_service only run once. It has to
happen after data is mounted for encrypted device.

Change-Id: I6e03064aba454569fccb00872a6a9a10d570662b