drm/amd/display: Remove duplicated include in dce110_hwseq.c

./drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c: dce110_hwseq.h is included more than once.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=6897


Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>