alpha: Fix ALPHA_EV56 dependencies typo

There appears to be a typo in the EV56 config option. NORITAKE and PRIMO are
be able to set a variation of either.
Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

arch/alpha/Kconfig

@@ -377,7 +377,7 @@ config ALPHA_EV56
 
 config ALPHA_EV56
 	prompt "EV56 CPU (speed >= 333MHz)?"
-	depends on ALPHA_NORITAKE && ALPHA_PRIMO
+	depends on ALPHA_NORITAKE || ALPHA_PRIMO
 
 config ALPHA_EV56
 	prompt "EV56 CPU (speed >= 400MHz)?"