zephyr: Bring in the Zephyr build
Add support for building mcuboot as a Zephyr application. This is
copied from the iotboot repo with some minor reorganization to work with
the mcuboot directory layout.
diff --git a/zephyr/include/sysflash/sysflash.h b/zephyr/include/sysflash/sysflash.h
new file mode 100644
index 0000000..e08f9eb
--- /dev/null
+++ b/zephyr/include/sysflash/sysflash.h
@@ -0,0 +1,10 @@
+/* Manual version of auto-generated version. */
+
+#ifndef __SYSFLASH_H__
+#define __SYSFLASH_H__
+
+#define FLASH_AREA_IMAGE_0 1
+#define FLASH_AREA_IMAGE_1 2
+#define FLASH_AREA_IMAGE_SCRATCH 3
+
+#endif /* __SYSFLASH_H__ */