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/iei/kino-780am2-fam10/dsdt.asl

@@ -924,7 +924,7 @@ DefinitionBlock (
 		*	Store(Arg0, Index(WKST,1))
 		* }
 		*/
-		\_SB.PCI0.SIOW (Arg0)
+		\_SB.PCI0.SIOW ()
 		Return(WKST)
 	} /* End Method(\_WAK) */
 
@@ -1491,7 +1491,7 @@ DefinitionBlock (
 					XPNP()
 				}
 			}
-			Method (SIOW, 1)
+			Method (SIOW, 0)
 			{
 				EPNP()
 				Store (0x4, LDN)