Add hd8122 download API.

Change-Id: Id631c2fbde1364240114e5527f85a4cf1d0987b3
diff --git a/mbtk/mbtk_gnssd/gnss_6228.c b/mbtk/mbtk_gnssd/gnss_6228.c
index 0cc248c..04cfc18 100755
--- a/mbtk/mbtk_gnssd/gnss_6228.c
+++ b/mbtk/mbtk_gnssd/gnss_6228.c
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