drm/amdgpu/display: fix warning on 32 bit in dmub

Use uintptr_t rather than uint64_t.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Harry Wentland <Harry.Wentland@amd.com>

drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c

@@ -510,7 +510,7 @@ enum dmub_status dmub_srv_hw_init(struct dmub_srv *dmub,
 
 	dmub_memset(&outbox0_rb_params, 0, sizeof(outbox0_rb_params));
 	outbox0_rb_params.ctx = dmub;
-	outbox0_rb_params.base_address = (void *)((uint64_t)(tracebuff_fb->cpu_addr) + TRACE_BUFFER_ENTRY_OFFSET);
+	outbox0_rb_params.base_address = (void *)((uintptr_t)(tracebuff_fb->cpu_addr) + TRACE_BUFFER_ENTRY_OFFSET);
 	outbox0_rb_params.capacity = tracebuff_fb->size - dmub_align(TRACE_BUFFER_ENTRY_OFFSET, 64);
 	dmub_rb_init(&dmub->outbox0_rb, &outbox0_rb_params);