drm/amd/display: Reapply fdedd77b0eb3

Commit 2563391e57b5 ("drm/amd/display: DML2.1 resynchronization") blew
away the compiler warning fix from commit 2fde4fdddc1f
("drm/amd/display: Avoid -Wenum-float-conversion in
add_margin_and_round_to_dfs_grainularity()"), causing the warning to
reappear.

drivers/gpu/drm/amd/amdgpu/../display/dc/dml2/dml21/src/dml2_dpmm/dml2_dpmm_dcn4.c:183:58: error: arithmetic between enumeration type 'enum dentist_divider_range' and floating-point type 'double' [-Werror,-Wenum-float-conversion]
183 | divider = (unsigned int)(DFS_DIVIDER_RANGE_SCALE_FACTOR * (vco_freq_khz / clock_khz));
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

Apply the fix again to resolve the warning.

Re-apply again after commit be4e3509314a ("drm/amd/display: DML21 Reintegration For Various Fixes")
This should be making its way back to the original DML trees this time. (Alex)

Fixes: be4e3509314a ("drm/amd/display: DML21 Reintegration For Various Fixes")
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3841
Signed-off-by: Nathan Chancellor <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_dpmm/dml2_dpmm_dcn4.c

···
 
 	clock_khz *= 1.0 + margin;
 
-	divider = (unsigned int)(DFS_DIVIDER_RANGE_SCALE_FACTOR * (vco_freq_khz / clock_khz));
+	divider = (unsigned int)((int)DFS_DIVIDER_RANGE_SCALE_FACTOR * (vco_freq_khz / clock_khz));
 
 	/* we want to floor here to get higher clock than required rather than lower */
 	if (divider < DFS_DIVIDER_RANGE_2_START) {