drm/i915: conversion to new logging macros in i915/i915_vgpu.c

Replace the use of printk based logging macros with the struct
drm_device based macros in i915/i915_vgpu.c

Signed-off-by: Wambui Karuga <wambui.karugax@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/45e8bffff8cbffd72ed41901c3db9f7f6dbe79f3.1578560355.git.wambui.karugax@gmail.com