drm/amd/display: Only actually breakpoint if DEBUG_KERNEL_DC is enabled

To match previous behavior and to not hang the kernel if someone
accidentally builds with KGDB enabled.

Fixes: 1aad7078 ("drm/amd/display: Make BREAK_TO_DEBUGGER() a debug print")
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/os_types.h

@@ -111,7 +111,7 @@
 #define ASSERT(expr) WARN_ON_ONCE(!(expr))
 #endif
 
-#if defined(CONFIG_HAVE_KGDB) || defined(CONFIG_KGDB)
+#if defined(CONFIG_DEBUG_KERNEL_DC) && (defined(CONFIG_HAVE_KGDB) || defined(CONFIG_KGDB))
 #define BREAK_TO_DEBUGGER() \
 	do { \
 		DRM_DEBUG_DRIVER("%s():%d\n", __func__, __LINE__); \