board: ti: AM43xx: added USB initializtion code

Implemented board_usb_init(), board_usb_cleanup() and
usb_gadget_handle_interrupts() in am43xx board file that
can be invoked by various gadget drivers.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
diff --git a/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h b/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h
index f6523ea..479893e 100644
--- a/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h
+++ b/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h
@@ -61,6 +61,15 @@
 /* RTC base address */
 #define RTC_BASE			0x44E3E000
 
+/* USB OTG */
+#define USB_OTG_SS1_BASE		0x48390000
+#define USB_OTG_SS1_GLUE_BASE		0x48380000
+#define USB2_PHY1_POWER			0x44E10620
+
+#define USB_OTG_SS2_BASE		0x483D0000
+#define USB_OTG_SS2_GLUE_BASE		0x483C0000
+#define USB2_PHY2_POWER			0x44E10628
+
 /* USB Clock Control */
 #define PRM_PER_USB_OTG_SS0_CLKCTRL (CM_PER + 0x260)
 #define PRM_PER_USB_OTG_SS1_CLKCTRL (CM_PER + 0x268)