acpi, arch/x86/smp/mpspec,soc/amd/common: Move MP_IRQ_ flags into acpi.h

The MP_IRQ flags can be used in the MP table and the ACPI MADT table.
Move them into acpi.h to avoid pulling in the full mpspec.h which is
only available on x86.

BUG=b:218874489, b:160595155
TEST=Build

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I4f1091b7629a6446fa399720b0270556a926401a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63845
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/common/block/include/amdblocks/chip.h

@@ -34,7 +34,7 @@ struct soc_amd_common_config {
 	 */
 	struct {
 		uint8_t irq;
-		/* See MP_IRQ_* from mpspec.h */
+		/* See MP_IRQ_* from acpi.h */
 		uint8_t flags;
 	} irq_override[16];