Input: i8042 - select ARCH_MIGHT_HAVE_PC_SERIO on alpha

Architectures which might use an i8042 for serial IO to keyboard,
mouse, etc should select ARCH_MIGHT_HAVE_PC_SERIO.
Signed-off-by: NMark Salter <msalter@redhat.com>
Acked-by: NMatt Turner <mattst88@gmail.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

arch/alpha/Kconfig

@@ -2,6 +2,7 @@ config ALPHA
 	bool
 	default y
 	select ARCH_MIGHT_HAVE_PC_PARPORT
+	select ARCH_MIGHT_HAVE_PC_SERIO
 	select HAVE_AOUT
 	select HAVE_IDE
 	select HAVE_OPROFILE