AGESA fam14 boards: Drop _SI scope with _SST in ASL

Change-Id: Ieb2f7a6b2721ddeef6945c3e0a0f4cc5627dd533
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50656
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/lippert/frontrunner-af/dsdt.asl

@@ -724,10 +724,5 @@ DefinitionBlock (
 			Name(_STA, 0x0B) /* sata is invisible */
 		}
 	} /* End \_SB scope */
-
-	Scope(\_SI) {
-		Method(_SST, 1) {
-		}
-	} /* End Scope SI */
 }
 /* End of ASL file */