Remove unnecessary "_external" suffix from libcppbor

Test: Build
Change-Id: If61f49d36ea954f8385012172d454cc803141a60
diff --git a/identity/Android.bp b/identity/Android.bp
index 6227bfe..a563532 100644
--- a/identity/Android.bp
+++ b/identity/Android.bp
@@ -59,7 +59,7 @@
         "android.hardware.identity-support-lib",
         "android.hardware.security.rkp-V3-cpp",
         "android.security.rkp_aidl-cpp",
-        "libcppbor_external",
+        "libcppbor",
         "libcredstore_aidl",
         "libkeymaster4support",
         "librkp_support",