drm/nvc0/pm: restrict pll mode to clocks that can actually use it

Fixes reclocking failure on some chips where we attempted to set PDAEMON
to PLL mode.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvc0_pm.c

@@ -269,7 +269,7 @@ calc_clk(struct drm_device *dev, int clk, struct nvc0_pm_clock *info, u32 freq)
 	clk0 = calc_div(dev, clk, clk0, freq, &div1D);
 
 	/* see if we can get any closer using PLLs */
-	if (clk0 != freq) {
+	if (clk0 != freq && (0x00004387 & (1 << clk))) {
 		if (clk < 7)
 			clk1 = calc_pll(dev, clk, freq, &info->coef);
 		else