Split out common part of linker script.

Bug: 223166344
Test: atest vmbase_example.integration_test
Change-Id: Idaf10e631ba33fcc7026c4e2f603778186215667
diff --git a/vmbase/Android.bp b/vmbase/Android.bp
index 473103e..e88420e 100644
--- a/vmbase/Android.bp
+++ b/vmbase/Android.bp
@@ -39,3 +39,8 @@
     },
     apex_available: ["com.android.virt"],
 }
+
+filegroup {
+    name: "vmbase_sections",
+    srcs: ["sections.ld"],
+}