ARM: bcm283x: use OF_CONTROL for bcm283x

This patch removes use of U_BOOT_DEVICE in board/raspberrypi/rpi/rpi.c,
enables OF_CONTROL in the config and adjusts the rpi_*defconfig configs.

Signed-off-by: Fabian Vogt <fvogt@suse.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/rpi_3_32b_defconfig b/configs/rpi_3_32b_defconfig
index 00b6ff4..954d5ff 100644
--- a/configs/rpi_3_32b_defconfig
+++ b/configs/rpi_3_32b_defconfig
@@ -2,6 +2,8 @@
 CONFIG_ARCH_BCM283X=y
 CONFIG_TARGET_RPI_3_32B=y
 CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_DEFAULT_DEVICE_TREE="bcm2837-rpi-3-b"
+CONFIG_OF_EMBED=y
 CONFIG_OF_BOARD_SETUP=y
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set