drm/amd/display: Fix typo for helpers function name

[why]
Word "helper" was misspelled as "helpes" in
dm_helpes_dmub_outbox0_interrupt_control function.

[how]
Fix the spelling.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Leo (Hanghong) Ma <hanghong.ma@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Solomon Chiu <solomon.chiu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c

@@ -698,7 +698,7 @@ void dm_helpers_free_gpu_mem(
 	}
 }
 
-bool dm_helpes_dmub_outbox0_interrupt_control(struct dc_context *ctx, bool enable)
+bool dm_helpers_dmub_outbox0_interrupt_control(struct dc_context *ctx, bool enable)
 {
 	// TODO
 	return true;

drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c

@@ -180,5 +180,5 @@ bool dc_dmub_srv_get_dmub_outbox0_msg(const struct dc *dc, struct dmcub_trace_bu
 
 void dc_dmub_trace_event_control(struct dc *dc, bool enable)
 {
-	dm_helpes_dmub_outbox0_interrupt_control(dc->ctx, enable);
+	dm_helpers_dmub_outbox0_interrupt_control(dc->ctx, enable);
 }

drivers/gpu/drm/amd/display/dc/dm_helpers.h

@@ -156,6 +156,6 @@ void dm_set_dcn_clocks(
 		struct dc_context *ctx,
 		struct dc_clocks *clks);
 
-bool dm_helpes_dmub_outbox0_interrupt_control(struct dc_context *ctx, bool enable);
+bool dm_helpers_dmub_outbox0_interrupt_control(struct dc_context *ctx, bool enable);
 
 #endif /* __DM_HELPERS__ */