drm/i915/dpt: move display/intel_dpt.c to i915_dpt.c
The DPT implementation is i915 specific. The xe driver has a different
implementation. Move display/intel_dpt.c to i915_dpt.c. Cleanups will
follow.
Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Link: https://patch.msgid.link/20a3bfb2762f39f9666d9a5752b8d2fb133583b0.1772030909.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>