drm/i915: Give all ioctl functions an _ioctl suffix

Most of our ioctl functions have an _ioctl suffix in the name. I like
that idea since it makes it easy to figure out how the function is
going to get called. Rename the handful of exceptions to follow the
same pattern.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180207164841.19431-1-ville.syrjala@linux.intel.com


Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>