drm/amdgpu/display: Use u64 divide macro for round up division

[why]
Fix compilation warnings on i386 architecture:
undefined reference to `__udivdi3'
[how]
Switch DIV_ROUND_UP to DIV64_U64_ROUND_UP

Reported-by: Randy Dunlap <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Mikita Lipski <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
1 file changed