radv: add missing 'discardtodemote' option in the debug list

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7220>
diff --git a/src/amd/vulkan/radv_device.c b/src/amd/vulkan/radv_device.c
index 3185d12..e589d86 100644
--- a/src/amd/vulkan/radv_device.c
+++ b/src/amd/vulkan/radv_device.c
@@ -529,6 +529,7 @@
 	{"allentrypoints", RADV_DEBUG_ALL_ENTRYPOINTS},
 	{"metashaders", RADV_DEBUG_DUMP_META_SHADERS},
 	{"nomemorycache", RADV_DEBUG_NO_MEMORY_CACHE},
+	{"discardtodemote", RADV_DEBUG_DISCARD_TO_DEMOTE},
 	{"llvm", RADV_DEBUG_LLVM},
 	{"forcecompress", RADV_DEBUG_FORCE_COMPRESS},
 	{NULL, 0}