vservices: Fix LLVM compilation errors for vservice drivers

vServices drivers compilation failed when it is compiled with
LLVM compiler. Fix the vService drivers to compile successfully.

Change-Id: Ie729480eb17c3156c63638edb4e47603cfad1ef2
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>
Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>