drm/i915/display: remove duplicated argument

Fix the following coccicheck warning:

./drivers/gpu/drm/i915/display/intel_display_power.c:3081:1-28:
 duplicated argument to & or |

This commit fixes duplicate argument. It might be a typo.
But what I can do is to remove it now.

Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210605032209.16111-1-wanjiabing@vivo.com