drm/amd/display: Remove duplicated function signature from dcn3.01 DCCG

In the header file dc/dcn301/dcn301_dccg.h, the function dccg301_create
is declared twice, so remove duplication.
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: David Tadokoro <davidbtadokoro@usp.br>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn301/dcn301_dccg.h

@@ -56,10 +56,4 @@ struct dccg *dccg301_create(
 	const struct dccg_shift *dccg_shift,
 	const struct dccg_mask *dccg_mask);
 
-struct dccg *dccg301_create(
-	struct dc_context *ctx,
-	const struct dccg_registers *regs,
-	const struct dccg_shift *dccg_shift,
-	const struct dccg_mask *dccg_mask);
-
 #endif //__DCN301_DCCG_H__