drm/amd/display: Simplify the calculation of variables

./drivers/gpu/drm/amd/display/dc/dml2/dml2_utils.c:236:49-51: WARNING !A || A && B is equivalent to !A || B.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=8169


Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>