vservices: core: Port core vservices drivers to linux 4.14

Vservices core drivers are broken on 4.14 kernel due to core
framework changes.This commit updates the virtual services
core to build and run on linux 4.14.

Change-Id: I53360a8b8431d58c4569d4d4c3b86f3c820b6faf
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>