Remove unnecessary "_external" suffix from libcppbor

Test: Build
Change-Id: Ied163d1f40c3b86d7b85cae1700310f5cb674e2d
diff --git a/security/keymint/aidl/default/Android.bp b/security/keymint/aidl/default/Android.bp
index c707845..de90b26 100644
--- a/security/keymint/aidl/default/Android.bp
+++ b/security/keymint/aidl/default/Android.bp
@@ -30,7 +30,7 @@
         "android.hardware.security.secureclock-V1-ndk",
         "libbase",
         "libbinder_ndk",
-        "libcppbor_external",
+        "libcppbor",
         "libcrypto",
         "libkeymaster_portable",
         "libkeymint",