powerpc/mpc8544ds: Add USB controller support for MPC8544DS

USB controller in uboot is a required feature for MPC8544DS. Without this
support there is no 'usb' command in uboot.

Signed-off-by: Jia Hongtao <B38951@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

include/configs/MPC8544DS.h

@@ -415,6 +415,18 @@ extern unsigned long get_board_sys_clk(unsigned long dummy);
     #define CONFIG_CMD_EXT2
 #endif
 
+/*
+ * USB
+ */
+#define CONFIG_USB_EHCI
+
+#ifdef CONFIG_USB_EHCI
+#define CONFIG_CMD_USB
+#define CONFIG_USB_EHCI_PCI
+#define CONFIG_EHCI_HCD_INIT_AFTER_RESET
+#define CONFIG_USB_STORAGE
+#define CONFIG_PCI_EHCI_DEVICE			0
+#endif
 
 #undef CONFIG_WATCHDOG			/* watchdog disabled */