ARM: rpi_b: enable USB/DHCP/PXE in bootcmd

USB support must be enabled before config_distro_bootcmd.h is included
for bootcmd to include USB-related functionality.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>

include/configs/rpi_b.h

@@ -77,6 +77,16 @@
 #define CONFIG_MMC_SDHCI_IO_ACCESSORS
 #define CONFIG_BCM2835_SDHCI
 
+#define CONFIG_CMD_USB
+#ifdef CONFIG_CMD_USB
+#define CONFIG_USB_DWC2
+#define CONFIG_USB_DWC2_REG_ADDR 0x20980000
+#define CONFIG_USB_STORAGE
+#define CONFIG_USB_HOST_ETHER
+#define CONFIG_USB_ETHER_SMSC95XX
+#define CONFIG_MISC_INIT_R
+#endif
+
 /* Console UART */
 #define CONFIG_PL011_SERIAL
 #define CONFIG_PL011_CLOCK		3000000
@@ -165,7 +175,10 @@
 	"ramdisk_addr_r=0x02100000\0" \
 
 #define BOOT_TARGET_DEVICES(func) \
-	func(MMC, mmc, 0)
+	func(MMC, mmc, 0) \
+	func(USB, usb, 0) \
+	func(PXE, pxe, na) \
+	func(DHCP, dhcp, na)
 #include <config_distro_bootcmd.h>
 
 #define CONFIG_EXTRA_ENV_SETTINGS \
@@ -175,14 +188,4 @@
 
 #define CONFIG_BOOTDELAY 2
 
-#define CONFIG_CMD_USB
-#ifdef CONFIG_CMD_USB
-#define CONFIG_USB_DWC2
-#define CONFIG_USB_DWC2_REG_ADDR 0x20980000
-#define CONFIG_USB_STORAGE
-#define CONFIG_USB_HOST_ETHER
-#define CONFIG_USB_ETHER_SMSC95XX
-#define CONFIG_MISC_INIT_R
-#endif
-
 #endif