Remove unnecessary "_external" suffix from libcppbor

Test: Build
Change-Id: If61f49d36ea954f8385012172d454cc803141a60
diff --git a/provisioner/Android.bp b/provisioner/Android.bp
index d0c934d..ede1ae6 100644
--- a/provisioner/Android.bp
+++ b/provisioner/Android.bp
@@ -39,7 +39,7 @@
         "android.hardware.drm-V1-ndk",
         "android.hardware.security.rkp-V3-ndk",
         "libbase",
-        "libcppbor_external",
+        "libcppbor",
         "libcppcose_rkp",
         "libjsoncpp",
         "libkeymint_remote_prov_support",