crypto: padlock - Restore dependency on x86

When we added 64-bit support to padlock the dependency on x86
was lost.  This causes build failures on non-x86 architectures.
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/Kconfig

@@ -12,7 +12,7 @@ if CRYPTO_HW
 
 config CRYPTO_DEV_PADLOCK
 	tristate "Support for VIA PadLock ACE"
-	depends on !UML
+	depends on X86 && !UML
 	select CRYPTO_ALGAPI
 	help
 	  Some VIA processors come with an integrated crypto engine