drm/amd/display: Fix duplicate included dce110_hw_sequencer.h

Clean up the following includecheck warning:

./drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c:
dce110_hw_sequencer.h is included more than once.

No functional change.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -32,7 +32,6 @@
 #include "core_status.h"
 #include "resource.h"
 #include "dm_helpers.h"
-#include "dce110_hw_sequencer.h"
 #include "dce110_timing_generator.h"
 #include "dce/dce_hwseq.h"
 #include "gpio_service_interface.h"