gnss: add log save

Change-Id: I5bc9e30eba57c51f70db5b5e0cc7162b785286e8
diff --git a/mbtk/mbtk_gnssd/Makefile b/mbtk/mbtk_gnssd/Makefile
index 521650c..4359afa 100755
--- a/mbtk/mbtk_gnssd/Makefile
+++ b/mbtk/mbtk_gnssd/Makefile
@@ -31,6 +31,7 @@
 					gnss_utils.c \
 					gnss_hd8122.c \
 					gnss_asr5311.c \
+					gnss_log.c \
 					gnss_n50db.c \
 					hd8122_dl/port.c \
 					hd8122_dl/fwup.c