MIPS: lantiq: enable pci clk conditional for xrx200 SoC

The xrx200 SoC family has the same PCI clock register layout as the AR9.
Enable the same quirk as for AR9

Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4235/

arch/mips/lantiq/xway/sysctrl.c

@@ -145,7 +145,8 @@ static int pci_enable(struct clk *clk)
 {
 	unsigned int val = ltq_cgu_r32(ifccr);
 	/* set bus clock speed */
-	if (of_machine_is_compatible("lantiq,ar9")) {
+	if (of_machine_is_compatible("lantiq,ar9") ||
+			of_machine_is_compatible("lantiq,vr9")) {
 		val &= ~0x1f00000;
 		if (clk->rate == CLOCK_33M)
 			val |= 0xe00000;