sb/intel/common/acpi/pcie.asl: Generalise file comment

This file is no longer specific to 6 and 7 series PCHs.

Change-Id: Ib89378bd6ba1d80281b92a79d37b9fdeaaed40fb
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46762
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/southbridge/intel/common/acpi/pcie.asl

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-/* Intel 6/7 Series PCH PCIe support */
-
-// PCI Express Ports
+/* Intel southbridge PCIe support */
 
 Method (IRQM, 1, Serialized) {