hwrng: via - support new Centaur CPU

New Centaur CPU(Family > 6) supprt Random Number Generator, but can't
support MSR_VIA_RNG. Just like VIA Nano.
Signed-off-by: David Wang <davidwang@zhaoxin.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/via-rng.c

@@ -135,7 +135,7 @@ static int via_rng_init(struct hwrng *rng)
 	 * is always enabled if CPUID rng_en is set.  There is no
 	 * RNG configuration like it used to be the case in this
 	 * register */
-	if ((c->x86 == 6) && (c->x86_model >= 0x0f)) {
+	if (((c->x86 == 6) && (c->x86_model >= 0x0f))  || (c->x86 > 6)){
 		if (!boot_cpu_has(X86_FEATURE_XSTORE_EN)) {
 			pr_err(PFX "can't enable hardware RNG "
 				"if XSTORE is not enabled\n");