Add gnss 5311 support.

Change-Id: I436cbc7eabe8e6448d318b6eee81f49dddcce756
diff --git a/mbtk/mbtk_gnssd/gnss_6228.c b/mbtk/mbtk_gnssd/gnss_6228.c
index 066ae36..0cc248c 100755
--- a/mbtk/mbtk_gnssd/gnss_6228.c
+++ b/mbtk/mbtk_gnssd/gnss_6228.c
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