drm/i915/dpt: pass obj, size instead of framebuffer to intel_dpt_create()

drm/i915/dpt: pass obj, size instead of framebuffer to intel_dpt_create()

Split the size determination between caller and callee to drop the
dependency on struct intel_framebuffer from DPT code, but avoid adding a
dependency on I915_GTT_PAGE_SIZE in the caller side.

Pass zero size to let intel_dpt_create() handle the regular obj->size
case, but remapped size if fb needs stride remap.

Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Link: https://patch.msgid.link/3a6e987ce8bb9f2c8d90c35342de14494a64de1b.1772030909.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>