drm/amd/display: Simplify the calculation of variables

./drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c:586:37-39: WARNING !A || A && B is equivalent to !A || B.
./drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c:595:37-39: WARNING !A || A && B is equivalent to !A || B.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=4941


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