libsysutils can be linked statically

Let libsysutils able to be statically linked by libnetd_resolv to
minimize the dependence on system ABI.

Test: m libsysutils
Change-Id: Ideb322dbc8d594a8a37d64f8140bc37090a4e238
diff --git a/libsysutils/Android.bp b/libsysutils/Android.bp
index 29d23c8..da5d86c 100644
--- a/libsysutils/Android.bp
+++ b/libsysutils/Android.bp
@@ -1,4 +1,4 @@
-cc_library_shared {
+cc_library {
     name: "libsysutils",
     vendor_available: true,
     vndk: {