mb/**/dsdt.asl: Remove outdated sleepstates.asl comment

Previously, each Intel chipset had its own sleepstates.asl file.
However, this is no longer the case, so drop these comments.

Change-Id: I50aba6e74f41e2fa498375b5eb6b7e993d06bcac
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37855
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-by: Wim Vervoorn <wvervoorn@eltan.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>

src/mainboard/siemens/mc_apl1/dsdt.asl

@@ -40,6 +40,5 @@ DefinitionBlock(
 		}
 	}
 
-	/* Chipset specific sleep states */
 	#include <southbridge/intel/common/acpi/sleepstates.asl>
 }