drm/amd/display: Use proper enum conversion functions

clang warns:

drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_pp_smu.c:336:8:
warning: implicit conversion from enumeration type 'enum smu_clk_type'
to different enumeration type 'enum amd_pp_clock_type'
[-Wenum-conversion]
                                        dc_to_smu_clock_type(clk_type),
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_pp_smu.c:421:14:
warning: implicit conversion from enumeration type 'enum
amd_pp_clock_type' to different enumeration type 'enum smu_clk_type'
[-Wenum-conversion]
                                        dc_to_pp_clock_type(clk_type),
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

There are functions to properly convert between all of these types, use
them so there are no longer any warnings.

Fixes: a43913e ("drm/amd/powerplay: add function get_clock_by_type_with_latency for navi10")
Fixes: e5e4e22 ("drm/amd/powerplay: add interface to get clock by type with latency for display (v2)")
Link: ClangBuiltLinux/linux#586
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -334,7 +334,7 @@ bool dm_pp_get_clock_levels_by_type(
 		}
 	} else if (adev->smu.funcs && adev->smu.funcs->get_clock_by_type) {
 		if (smu_get_clock_by_type(&adev->smu,
-					  dc_to_smu_clock_type(clk_type),
+					  dc_to_pp_clock_type(clk_type),
 					  &pp_clks)) {
 			get_default_clock_levels(clk_type, dc_clks);
 			return true;
@@ -419,7 +419,7 @@ bool dm_pp_get_clock_levels_by_type_with_latency(
 			return false;
 	} else if (adev->smu.ppt_funcs && adev->smu.ppt_funcs->get_clock_by_type_with_latency) {
 		if (smu_get_clock_by_type_with_latency(&adev->smu,
-						       dc_to_pp_clock_type(clk_type),
+						       dc_to_smu_clock_type(clk_type),
 						       &pp_clks))
 			return false;
 	}