Add mbtk_gnss_5311.c

Change-Id: I2455916a926cd99da2e46825f9780e4903fad1c6
diff --git a/mbtk/mbtk_lib/src/mbtk_gnss_5311.c b/mbtk/mbtk_lib/src/mbtk_gnss_5311.c
new file mode 100755
index 0000000..8b13789
--- /dev/null
+++ b/mbtk/mbtk_lib/src/mbtk_gnss_5311.c
@@ -0,0 +1 @@
+