drm/amd/display: Add hdcp to Kconfig

[Why]
HDCP is not fully finished, so we need to be able to
build and run the driver without it.

[How]
Add a Kconfig to toggle it
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/Kconfig

@@ -44,6 +44,14 @@ config DRM_AMD_DC_DSC_SUPPORT
 	    Choose this option if you want to have
 	    Dynamic Stream Compression support
 
+config DRM_AMD_DC_HDCP
+        bool "Enable HDCP support in DC"
+        depends on DRM_AMD_DC
+        help
+         Choose this option
+         if you want to support
+         HDCP authentication
+
 config DEBUG_KERNEL_DC
 	bool "Enable kgdb break in DC"
 	depends on DRM_AMD_DC