Add sepolicy for biometric fingerprint virtual hal

Bug: 326227403
Test: atest BiometricsE2eTests:BiometricPromptAuthSuccessTest -c
Change-Id: Ibdd05e770e17e9fec53358f0334e90d6b58141f2
diff --git a/apex/com.android.biometrics.virtual.fingerprint-file_contexts b/apex/com.android.biometrics.virtual.fingerprint-file_contexts
new file mode 100644
index 0000000..940934b
--- /dev/null
+++ b/apex/com.android.biometrics.virtual.fingerprint-file_contexts
@@ -0,0 +1,2 @@
+(/.*)?                  u:object_r:system_file:s0
+/bin/hw/android\.hardware\.biometrics\.fingerprint-service\.example u:object_r:virtual_fingerprint_exec:s0