rockchip: Move to standard boot

Drop the distro-boot scripts and use standard boot instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Jonas Karlman <jonas@kwiboo.se>
diff --git a/include/configs/rv1108_common.h b/include/configs/rv1108_common.h
index 050d37b..3bf70a0 100644
--- a/include/configs/rv1108_common.h
+++ b/include/configs/rv1108_common.h
@@ -28,6 +28,6 @@
 	ENV_MEM_LAYOUT_SETTINGS \
 	"fdtfile=" CONFIG_DEFAULT_FDT_FILE "\0" \
 	"partitions=" PARTS_DEFAULT \
-	BOOTENV
+	"boot_targets=" BOOT_TARGETS "\0"
 
 #endif