Add version to firmware image

src/common/version.c

@@ -0,0 +1,17 @@
+#include <common/macro.h>
+
+static const char __code BOARD[] =
+    "76EC_BOARD="
+    xstr(__BOARD__);
+
+static const char __code VERSION[] =
+    "76EC_VERSION="
+    xstr(__VERSION__);
+
+const char * board() {
+    return &BOARD[11];
+}
+
+const char * version() {
+    return &VERSION[13];
+}