drm/i915: Finalize contexts in GEM_CONTEXT_CREATE on version 13+

All the proto-context stuff for context creation exists to allow older
userspace drivers to set VMs and engine sets via SET_CONTEXT_PARAM.
Drivers need to update to use CONTEXT_CREATE_EXT_* for this going
forward.  Force the issue by blocking the old mechanism on any future
hardware generations.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Carl Zhang <carl.zhang@intel.com>
Cc: Michal Mrozek <michal.mrozek@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210708154835.528166-31-jason@jlekstrand.net