soc/intel/common/cnvi: Fix path for CFLR method

The CLFR method exists outside the CNVi device, so add `^` to allow
it to be found. This fixes the SSDT and allows the method to be used.

TEST=build/boot starlabs/starlite_adl

Change-Id: I1158cf1ccf50d9095fdab8d2d663041ef1985513
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85885
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>

src/soc/intel/common/block/cnvi/cnvi.c

@@ -189,7 +189,7 @@ static void cnvw_fill_ssdt(const struct device *dev)
 
 			acpigen_write_if_lequal_op_int(LOCAL0_OP, 0);
 			{
-				acpigen_emit_namestring("CFLR");
+				acpigen_emit_namestring("^CFLR");
 
 				acpigen_write_store_int_to_namestr(1, "PRRS");