drm/amd/display: Remove duplicated code

DCN_MINIMUM_DISPCLK_Khz and DCN_MINIMUM_DPPCLK_Khz is declared twice.
This commit removes that duplication.
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h

@@ -29,9 +29,6 @@
 #include "dc.h"
 #include "dm_pp_smu.h"
 
-#define DCN_MINIMUM_DISPCLK_Khz 100000
-#define DCN_MINIMUM_DPPCLK_Khz 100000
-
 /* Constants */
 #define DDR4_DRAM_WIDTH   64
 #define WM_A 0