tree/acpi: Replace constant "Zero" with actual number

Change-Id: I5a3e3506415f424bf0fdd48fc449520a76622af5
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71525
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/acpi/dsdt_top.asl

@@ -10,8 +10,8 @@
 /* Operating system enumeration. */
 Name (OSYS, 0)
 
-/* Zero => PIC mode, 1 => APIC Mode */
-Name (PICM, Zero)
+/* 0 => PIC mode, 1 => APIC Mode */
+Name (PICM, 0)
 
 /* Power state (AC = 1) */
 Name (PWRS, 1)