vservices: transport: Port transport vservice driver to linux 4.14

vservices transport driver is broken on 4.14 kernel due to kernel
primitives changes like DMA and few general macros. This commit
updates transport driver to build and run on linux 4.14.

Change-Id: I1acbeddcde106e5e1b64a4babfca28fde895a245
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>