drm/i915/gt: reconcile Excess struct member kernel-doc warnings

drm/i915/gt: reconcile Excess struct member kernel-doc warnings

Document nested struct members with full names as described in
Documentation/doc-guide/kernel-doc.rst.

intel_gsc.h:34: warning: Excess struct member 'gem_obj' description in 'intel_gsc'

Also add missing field member descriptions.

Signed-off-by: Randy Dunlap <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: [email protected]
Cc: Jonathan Corbet <[email protected]>
Cc: [email protected]
Reviewed-by: Rodrigo Vivi <[email protected]>
Cc: Andi Shyti <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit cd1d91115ff1929ec346d85f512ef260ddf8131e)
Signed-off-by: Joonas Lahtinen <[email protected]>