soc/intel/common/block/acpi: Factor out common platform.asl

This patch moves platform.asl into common block acpi directory to
avoid duplicating the same ASL code block across SoC directory.

TEST=Able to build and boot TGL, CNL and CML platform.
1) Dump and disassemble DSDT, verify _PIC method present inside
common platform.asl is still there.
2) Verify no ACPI error seen while running 'dmesg` from console.

Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Change-Id: I5189b03d6abfaec39882d28b40a9bfa002128be3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45982
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/tigerlake/acpi/platform.asl

@@ -1,20 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-
-/* Enable ACPI _SWS methods */
-#include <soc/intel/common/acpi/acpi_wake_source.asl>
-/* Generic indicator for sleep state */
-#include <soc/intel/common/acpi/platform.asl>
-
-/*
- * The _PIC method is called by the OS to choose between interrupt
- * routing via the i8259 interrupt controller or the APIC.
- *
- * _PIC is called with a parameter of 0 for i8259 configuration and
- * with a parameter of 1 for Local Apic/IOAPIC configuration.
- */
-
-Method (_PIC, 1)
-{
-	/* Remember the OS' IRQ routing choice. */
-	PICM = Arg0
-}