stm32f7: added USB OTG FS/HS

Originally tracked at https://github.com/libopencm3/libopencm3/pull/958
While it doesn't work for everyone, this is clearly the basic first
steps required for any progress to be made.

Reviewed-by: Karl Palsson <karlp@tweak.net.au>

include/libopencm3/usb/dwc/otg_fs.h

@@ -28,7 +28,7 @@
 #include <libopencm3/usb/dwc/otg_common.h>
 
 /* Memory map is required for USB_OTG_FS_BASE address */
-#if defined(STM32F1) || defined(STM32F2) || defined(STM32F4) || defined(STM32L4)
+#if defined(STM32F1) || defined(STM32F2) || defined(STM32F4) || defined(STM32F7) || defined(STM32L4)
 #	include <libopencm3/stm32/memorymap.h>
 #elif defined(EFM32HG)
 #	include <libopencm3/efm32/memorymap.h>

include/libopencm3/usb/dwc/otg_hs.h

@@ -28,7 +28,7 @@
 #include <libopencm3/usb/dwc/otg_common.h>
 
 /* Memory map is required for USB_OTG_HS_BASE address */
-#if defined(STM32F2) || defined(STM32F4)
+#if defined(STM32F2) || defined(STM32F4) || defined(STM32F7)
 #	include <libopencm3/stm32/memorymap.h>
 #else
 #	error "device family not supported by dwc/otg_hs."

lib/stm32/f7/Makefile

@@ -66,6 +66,9 @@ OBJS += usart_common_all.o usart_common_v2.o
 # Ethernet
 OBJS += mac.o phy.o mac_stm32fxx7.o phy_ksz80x1.o
 
+OBJS    += usb.o usb_standard.o usb_control.o usb_dwc_common.o \
+          usb_f107.o usb_f207.o usb_msc.o
+
 VPATH += ../../usb:../:../../cm3:../common
 VPATH += ../../ethernet