lib: qmi: Add logging to debug QMI Encode/Decode Library

Add logging macros to QMI Encode/Decode Library to enable debugging.
Add a kernel config to enable/disable the logging.

Change-Id: I9d8b44b2e75f281067161618f2a02a660c4d6812
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
diff --git a/lib/Kconfig b/lib/Kconfig
index f1621d5..8437e36 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -387,4 +387,11 @@
 	  The kernel drivers receive the QMI message over a transport
 	  and then decode it into a C structure.
 
+config QMI_ENCDEC_DEBUG
+	bool
+	help
+	  Kernel config option to enable debugging QMI Encode/Decode
+	  library. This will log the information regarding the element
+	  and message being encoded & decoded.
+
 endmenu