mainboard/amd/*: Remove unused arguments from SIOW ACPI method

Since the SIOW method doesn't use any arguments, don't pass it any,
and initialize it as not using any.

Change-Id: I3fa2ab8afb7d09c176a94bbd1db27587c36030cd
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/26126
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/mainboard/biostar/am1ml/acpi/sio.asl

@@ -76,12 +76,3 @@ Method (SIOS, 1)
 		XPNP()
 	}
 }
-Method (SIOW, 1)
-{
-	EPNP()
-	Store (0x4, LDN)
-	Store (Zero, APC0) /* disable keyboard PME */
-	Store (0x4, LDN)
-	Store (0xFF, APC1) /* clear keyboard PME status */
-	XPNP()
-}