drm/panic: Add missing static inline to drm_panic_is_enabled()

This breaks build if DRM_PANIC is not enabled.
Also add the missing include drm_crtc_internal.h in drm_panic.c

Fixes: 9f774c42 ("drm/panic: Add drm_panic_is_enabled()")
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240719122051.1507927-1-jfalempe@redhat.com

drivers/gpu/drm/drm_crtc_internal.h

@@ -321,7 +321,7 @@ drm_edid_load_firmware(struct drm_connector *connector)
 #ifdef CONFIG_DRM_PANIC
 bool drm_panic_is_enabled(struct drm_device *dev);
 #else
-bool drm_panic_is_enabled(struct drm_device *dev) {return false; }
+static inline bool drm_panic_is_enabled(struct drm_device *dev) { return false; }
 #endif
 
 #endif /* __DRM_CRTC_INTERNAL_H__ */

drivers/gpu/drm/drm_panic.c

@@ -27,6 +27,8 @@
 #include <drm/drm_plane.h>
 #include <drm/drm_print.h>
 
+#include "drm_crtc_internal.h"
+
 MODULE_AUTHOR("Jocelyn Falempe");
 MODULE_DESCRIPTION("DRM panic handler");
 MODULE_LICENSE("GPL");