drm/i915: Rename pipe update tracepoints

All the other display related tracepoints use intel_ instead
if i915_ as the prefix. Do the same for the pipe update
tracepoints so I don't always have to spend time looking for
them.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191213133453.22152-6-ville.syrjala@linux.intel.com


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