[ion/device/external_flash] Move model specific code

As the N0100 does not have an external flash chip, the code to handle
the external flash does not need to be compiled on this model.

ion/src/device/n0100/Makefile

@@ -1,5 +1,6 @@
 ion_device_src += $(addprefix ion/src/device/n0100/drivers/, \
   board.cpp \
+  external_flash.cpp \
   led.cpp \
   power.cpp \
   reset.cpp \

ion/src/device/n0100/drivers/external_flash.cpp

@@ -0,0 +1,18 @@
+#include <drivers/external_flash.h>
+
+namespace Ion {
+namespace Device {
+namespace ExternalFlash {
+
+void init() {}
+void shutdown() {}
+
+void MassErase() {}
+int SectorAtAddress(uint32_t) { return 0; }
+void EraseSector(int) {}
+void WriteMemory(uint8_t *, const uint8_t *, size_t) {}
+void JDECid(uint8_t *, uint8_t *, uint8_t *) {}
+
+}
+}
+}

ion/src/device/n0110/Makefile

@@ -1,6 +1,7 @@
 ion_device_src += $(addprefix ion/src/device/n0110/drivers/, \
   board.cpp \
   cache.cpp \
+  external_flash.cpp \
   led.cpp \
   power.cpp \
   reset.cpp \

ion/src/device/n0110/drivers/external_flash.cpp

@@ -1,4 +1,4 @@
-#include "external_flash.h"
+#include <drivers/external_flash.h>
 #include <drivers/cache.h>
 #include <drivers/config/external_flash.h>
 #include <drivers/config/clocks.h>

ion/src/device/shared/drivers/Makefile

@@ -12,7 +12,6 @@ ion_device_src += $(addprefix ion/src/device/shared/drivers/, \
   display.cpp \
   events_keyboard_platform.cpp \
   exam_mode.cpp \
-  external_flash.cpp \
   flash.cpp \
   internal_flash.cpp \
   keyboard.cpp \

ion/src/device/shared/usb/Makefile

@@ -43,6 +43,7 @@ ion_device_dfu_src += libaxx/src/cxxabi/pure_virtual.cpp
 ion_device_dfu_src += ion/src/device/shared/usb/boot.cpp
 ion_device_dfu_src += ion/src/device/$(MODEL)/drivers/board.cpp
 ion_device_dfu_src += ion/src/device/$(MODEL)/drivers/cache.cpp
+ion_device_dfu_src += ion/src/device/$(MODEL)/drivers/external_flash.cpp
 ion_device_dfu_src += ion/src/device/$(MODEL)/drivers/reset.cpp
 ion_device_dfu_src += ion/src/device/$(MODEL)/drivers/usb.cpp
 ion_device_dfu_src += $(addprefix ion/src/device/shared/drivers/, \
@@ -54,7 +55,6 @@ ion_device_dfu_src += $(addprefix ion/src/device/shared/drivers/, \
   crc32.cpp \
   display.cpp \
   events_keyboard_platform.cpp \
-  external_flash.cpp \
   flash.cpp \
   internal_flash.cpp \
   keyboard.cpp \