mainboard,ASL: Trivial - drop trailing blank lines at EOF

Change-Id: Ib531a54db7df6b49a6218f689dcaab712e9dfb01
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/6292
Tested-by: build bot (Jenkins)
Reviewed-by: Idwer Vollering <vidwer@gmail.com>

src/mainboard/amd/persimmon/acpi/sleep.asl

@@ -118,4 +118,3 @@ Method(\_WAK, 1) {
 	*/
 	Return(WKST)
 } /* End Method(\_WAK) */
-