Make {vendor_,}ramdisk_available.

Making libselinux available to ramdisk and vendor_ramdisk
modules. Ramdisk and vendor_ramdisk modules are typically
used by first stage init.

This is the prerequisite to make toybox available to ramdisk
and vendor_ramdisk, so that first stage console can use shell
utilities.

Test: pass
Bug: 156098440

Change-Id: I8289eb12ce5a90fc68fcd432a2eef4240c87a7d2
diff --git a/libselinux/Android.bp b/libselinux/Android.bp
index 698780e..e08c918 100644
--- a/libselinux/Android.bp
+++ b/libselinux/Android.bp
@@ -104,6 +104,8 @@
 
     llndk_stubs: "libselinux.llndk",
 
+    ramdisk_available: true,
+    vendor_ramdisk_available: true,
     recovery_available: true,
 
     host_supported: true,