ec/clevo/it5570e/acpi: Replace Index(a, b) with ASL 2.0 syntax

Replace `Index (FOO, 1337)` with `FOO[1337]`.

Change-Id: If035eac6b6eb06f79eb6596364bc41069ba42f70
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70532
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
diff --git a/src/ec/clevo/it5570e/acpi/hid.asl b/src/ec/clevo/it5570e/acpi/hid.asl
index 10d23f5..945e285 100644
--- a/src/ec/clevo/it5570e/acpi/hid.asl
+++ b/src/ec/clevo/it5570e/acpi/hid.asl
@@ -48,7 +48,7 @@
 					Case (3)
 					{
 						/* Driver status */
-						HRDY = DeRefOf (Index (Arg3, 0))
+						HRDY = DeRefOf (Arg3[0])
 					}
 					Case (4)
 					{