drm/amd/display: remove unused variables res_create_maximus_funcs and debug_defaults_diags

gcc with W=1 reports
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn20/dcn20_resource.c:1069:43: error:
  ‘res_create_maximus_funcs’ defined but not used [-Werror=unused-const-variable=]
 1069 | static const struct resource_create_funcs res_create_maximus_funcs = {
      |                                           ^~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn20/dcn20_resource.c:727:38: error:
  ‘debug_defaults_diags’ defined but not used [-Werror=unused-const-variable=]
  727 | static const struct dc_debug_options debug_defaults_diags = {
      |                                      ^~~~~~~~~~~~~~~~~~~~

These variables are not used so remove them.

Fixes: 25879d7b ("drm/amd/display: Clean FPGA code in dc")
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

@@ -724,22 +724,6 @@ static const struct dc_debug_options debug_defaults_drv = {
 		.underflow_assert_delay_us = 0xFFFFFFFF,
 };
 
-static const struct dc_debug_options debug_defaults_diags = {
-		.disable_dmcu = false,
-		.force_abm_enable = false,
-		.timing_trace = true,
-		.clock_trace = true,
-		.disable_dpp_power_gate = true,
-		.disable_hubp_power_gate = true,
-		.disable_clock_gate = true,
-		.disable_pplib_clock_request = true,
-		.disable_pplib_wm_range = true,
-		.disable_stutter = true,
-		.scl_reset_length10 = true,
-		.underflow_assert_delay_us = 0xFFFFFFFF,
-		.enable_tri_buf = true,
-};
-
 void dcn20_dpp_destroy(struct dpp **dpp)
 {
 	kfree(TO_DCN20_DPP(*dpp));
@@ -1066,13 +1050,6 @@ static const struct resource_create_funcs res_create_funcs = {
 	.create_hwseq = dcn20_hwseq_create,
 };
 
-static const struct resource_create_funcs res_create_maximus_funcs = {
-	.read_dce_straps = NULL,
-	.create_audio = NULL,
-	.create_stream_encoder = NULL,
-	.create_hwseq = dcn20_hwseq_create,
-};
-
 static void dcn20_pp_smu_destroy(struct pp_smu_funcs **pp_smu);
 
 void dcn20_clock_source_destroy(struct clock_source **clk_src)