drm/i915/uapi: introduce drm_i915_gem_create_ext

Same old gem_create but with now with extensions support. This is needed
to support various upcoming usecases.

v2:(Chris)
    - Use separate ioctl number for gem_create_ext, instead of hijacking
      the existing gem_create ioctl, otherwise we run into the issue
      with being unable to detect if the kernel supports the new extension
      behaviour.
    - We now have gem_create_ext.flags, which should be zeroed.
    - I915_GEM_CREATE_EXT_SETPARAM value is now zero, since this is the
      index into our array of extensions.
    - Setup a "vanilla" object which we can directly apply our extensions
      to.
v3:(Daniel & Jason)
    - drop I915_GEM_CREATE_EXT_SETPARAM. Instead just have each extension
      do one thing only, instead of generic setparam which can cover
      various use cases.
    - add some kernel-doc.

Signed-off-by: Matthew Auld <[email protected]>
Signed-off-by: CQ Tang <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Cc: Jordan Justen <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Kenneth Graunke <[email protected]>
Cc: Jason Ekstrand <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Kenneth Graunke <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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