drm/radeon/uvd: Replace nested max() with single max3()

Use max3() macro instead of nesting max() to simplify the return
statement.

Signed-off-by: FengWei <feng.wei8@zte.com.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_uvd.c

@@ -961,7 +961,7 @@ int radeon_uvd_calc_upll_dividers(struct radeon_device *rdev,
 	unsigned optimal_score = ~0;
 
 	/* loop through vco from low to high */
-	vco_min = max(max(vco_min, vclk), dclk);
+	vco_min = max3(vco_min, vclk, dclk);
 	for (vco_freq = vco_min; vco_freq <= vco_max; vco_freq += 100) {
 
 		uint64_t fb_div = (uint64_t)vco_freq * fb_factor;