nb/intel/haswell/acpi: Do not add PEG devices for LP

Haswell Low Power variants do not have PEG at all.

Change-Id: Ia5577104b00bfc8713b54c3c43f8dcdd3bc367df
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46791
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/haswell/acpi/hostbridge.asl

@@ -200,5 +200,7 @@ Device (PDRC)
 /* Configurable TDP */
 #include "ctdp.asl"
 
+#if !CONFIG(INTEL_LYNXPOINT_LP)
 /* PCI Express Graphics */
 #include "peg.asl"
+#endif