staging: vc04_services: vc-sm-cma: Remove deprecated header

The vchiq_connected.h header was removed in f875976e ("staging:
vc04_services: Drop vchiq_connected.[ch] files") to simplify the
implementation.

Update the vc_sm driver accordingly which can still use the same
functions through the vchiq_arm.h header declarations.

Fixes: b1ab7a05 ("staging: vc04_services: Add new vc-sm-cma driver")
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>