Statically link libbase for mainline module tests

b/310046696 introduced a breaking ABI change in libbase, and
the following unit tests fail to launch on previous
platforms because of missing symbols:
  - libnetworkstats_test
  - netd_updatable_unit_test

Bug: 316464217
Test: atest libnetworkstats_test
Test: atest netd_updatable_unit_test
Change-Id: Icef58de0b46c6042a9459d3d4c45ea9ce2baefed
diff --git a/netd/Android.bp b/netd/Android.bp
index 4325d89..3cdbc97 100644
--- a/netd/Android.bp
+++ b/netd/Android.bp
@@ -69,10 +69,10 @@
         "BpfBaseTest.cpp"
     ],
     static_libs: [
+        "libbase",
         "libnetd_updatable",
     ],
     shared_libs: [
-        "libbase",
         "libcutils",
         "liblog",
         "libnetdutils",