SDL_video: try to bootstrap KMSDRM before RPI video driver

Allow better coexistence between RPI's vendor libraries and VC4 mesa driver.

src/video/SDL_video.c

@@ -97,12 +97,12 @@ static VideoBootStrap *bootstrap[] = {
 #if SDL_VIDEO_DRIVER_PSP
     &PSP_bootstrap,
 #endif
-#if SDL_VIDEO_DRIVER_RPI
-    &RPI_bootstrap,
-#endif 
 #if SDL_VIDEO_DRIVER_KMSDRM
     &KMSDRM_bootstrap,
 #endif
+#if SDL_VIDEO_DRIVER_RPI
+    &RPI_bootstrap,
+#endif
 #if SDL_VIDEO_DRIVER_NACL
     &NACL_bootstrap,
 #endif