powerpc/usb:Differentiate USB controller base address

Introduce different macros for storing addresses of multiple
USB controllers. This is required for successful initialization
and usage of multiple USB controllers inside u-boot

Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com>
diff --git a/arch/powerpc/cpu/mpc83xx/cpu_init.c b/arch/powerpc/cpu/mpc83xx/cpu_init.c
index 0e9ddb8..00572de 100644
--- a/arch/powerpc/cpu/mpc83xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc83xx/cpu_init.c
@@ -315,7 +315,7 @@
 #endif
 #if defined(CONFIG_USB_EHCI_FSL) && defined(CONFIG_MPC831x)
 	uint32_t temp;
-	struct usb_ehci *ehci = (struct usb_ehci *)CONFIG_SYS_FSL_USB_ADDR;
+	struct usb_ehci *ehci = (struct usb_ehci *)CONFIG_SYS_FSL_USB1_ADDR;
 
 	/* Configure interface. */
 	setbits_be32(&ehci->control, REFSEL_16MHZ | UTMI_PHY_EN);