gralloc3: [g19] symlink gralloc1_priv

gralloc1_priv.h points to gralloc3_priv.h so that
Other libraries including gralloc1_priv.h don't
need to modify their code use gralloc3

Change-Id: Ied18845d05a06de40f5b65808efb630a183d9beb
Signed-off-by: SeYeong Byeon <sy.byeon@samsung.com>
diff --git a/include/gralloc1_priv.h b/include/gralloc1_priv.h
new file mode 120000
index 0000000..980a5df
--- /dev/null
+++ b/include/gralloc1_priv.h
@@ -0,0 +1 @@
+gralloc3_priv.h
\ No newline at end of file