integrate libosmocore logging into firmware

We do so using our own 'raw' log target to avoid the 4k-on-stack
buffer of libosmocore _output() function.

Change-Id: I7a10b5b2b50bcee0154a1fa3fc43756aec836226
diff --git a/sysmoOCTSIM/logging.h b/sysmoOCTSIM/logging.h
new file mode 100644
index 0000000..900f88e
--- /dev/null
+++ b/sysmoOCTSIM/logging.h
@@ -0,0 +1,8 @@
+#pragma once
+
+#include <osmocom/core/logging.h>
+
+enum {
+	DUSB,
+	DCCID
+};