Add GNSS N50DB support.

Change-Id: Id65a69a0a7c149ef1e75db01e544f94b4f178d45
diff --git a/mbtk/mbtk_gnssd/Makefile b/mbtk/mbtk_gnssd/Makefile
old mode 100644
new mode 100755
index 87611b1..6327047
--- a/mbtk/mbtk_gnssd/Makefile
+++ b/mbtk/mbtk_gnssd/Makefile
@@ -31,6 +31,7 @@
 					gnss_utils.c \
 					gnss_hd8122.c \
 					gnss_asr5311.c \
+					gnss_n50db.c \
 					hd8122_dl/port.c \
 					hd8122_dl/fwup.c