The 'create' parameter in exec_queue_user_extensions was always true.
This commit removes the dead parameter and all the relevant dead code.

v2: rebase.
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240223143043.22779-1-nirmoy.das@intel.comSigned-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>