Rendercopy/skl: Remove redundant field to fix GPU hang

Rendercopy/skl: Remove redundant field to fix GPU hang

After applying the commit(982f7eb238a0898c456e0574dee7c4507738d75f), the
OUT_RELOC is updated on Broadwell and later, which is to handle the
64-bit field of gfx address internally. In such case some commands
should be fixed, otherwise GPU hang will be triggered when running
rendercopy.  (It is already fixed on Broadwell)

Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>