libpdx_default_transport: Link libselinux dynamically instead of statically.

The motivation of this change is to reduce binary size. On my sailfish-userdebug
build the size of libpdx_default_transport.so decreases by 416KB.

Change-Id: Ia4518127b02c3817bf1f3d351aac301a172cd9dd
diff --git a/libs/vr/libpdx_uds/Android.bp b/libs/vr/libpdx_uds/Android.bp
index d640950..1d6eea2 100644
--- a/libs/vr/libpdx_uds/Android.bp
+++ b/libs/vr/libpdx_uds/Android.bp
@@ -26,8 +26,6 @@
     ],
     shared_libs: [
         "libbinder",
-    ],
-    whole_static_libs: [
         "libselinux",
     ],
 }
@@ -57,5 +55,6 @@
         "liblog",
         "libutils",
         "libbinder",
+        "libselinux",
     ],
 }