drm/amd/display: Add DCN_VM aperture registers

[Why]
For later use by the DC VM implementation
Signed-off-by: Eryk Brol <eryk.brol@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubp.h

@@ -595,6 +595,9 @@
 	type AGP_BASE;\
 	type AGP_BOT;\
 	type AGP_TOP;\
+	type DCN_VM_SYSTEM_APERTURE_DEFAULT_SYSTEM;\
+	type DCN_VM_SYSTEM_APERTURE_DEFAULT_ADDR_MSB;\
+	type DCN_VM_SYSTEM_APERTURE_DEFAULT_ADDR_LSB;\
 	/* todo:  get these from GVM instead of reading registers ourselves */\
 	type PAGE_DIRECTORY_ENTRY_HI32;\
 	type PAGE_DIRECTORY_ENTRY_LO32;\