arm: rpi: Enable USB support on RPi

Enable DWC2 USB, storage and ethernet support. Tested on RPi B+.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Tom Rini <trini@ti.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Pavel Machek <pavel@denx.de>

include/configs/rpi_b.h

@@ -124,13 +124,7 @@
 
 /* Some things don't make sense on this HW or yet */
 #undef CONFIG_CMD_FPGA
-#undef CONFIG_CMD_NET
-#undef CONFIG_CMD_NFS
 #undef CONFIG_CMD_SAVEENV
-#undef CONFIG_CMD_DHCP
-#undef CONFIG_CMD_MII
-#undef CONFIG_CMD_NET
-#undef CONFIG_CMD_PING
 
 /* Environment */
 #define ENV_DEVICE_SETTINGS \
@@ -181,4 +175,13 @@
 
 #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
+#endif
+
 #endif