Add new error for system errors that are retryable

Some issues require a system error to be raised that
indicates we should retry the process. This adds a new
error and bumps the version of the api for future use.

Test: atest keystore2_test
Bug: 238619180
Change-Id: Iff8fa83f7b223e08de9fa31434e16aa3aa2153f6
diff --git a/keystore2/test_utils/Android.bp b/keystore2/test_utils/Android.bp
index e37ba60..602c98c 100644
--- a/keystore2/test_utils/Android.bp
+++ b/keystore2/test_utils/Android.bp
@@ -46,7 +46,7 @@
         "libkeystore-engine",
     ],
     shared_libs: [
-        "android.system.keystore2-V3-ndk",
+        "android.system.keystore2-V4-ndk",
         "libbase",
         "libcrypto",
         "libkeymaster_portable",