Add INTEL_MEI_GSC_PROXY=m
The proxy component is required to enable GSC to CSME communication on MTL, which is in turn needed for HDCP and PXP.
A full test run with this option enabled has been performed via trybot [1] and no GSC-related issues were seen:
[1] https://patchwork.freedesktop.org/series/120236/ Signed-off-by: Daniele Ceraolo Spurio daniele.ceraolospurio@intel.com