init: Add support for GSI installations in first-stage mount.

Bug: 121209697
Test: gsi boots
Change-Id: I69db0f8e999da366e46728b1008602f543cd79f6
diff --git a/init/Android.mk b/init/Android.mk
index bdd0301..69c63e1 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -91,6 +91,7 @@
     libz \
     libselinux \
     libcap \
+    libgsi \
 
 LOCAL_SANITIZE := signed-integer-overflow
 # First stage init is weird: it may start without stdout/stderr, and no /proc.