Add new syscall used by new unwinder.

The new unwinder also uses process_vm_readv, so added to all policies.

Bug: 65166211

Test: Did debuggerd -b of media.extractor and media.codec process.
Change-Id: Ifad0bc505602ec4879b0a8efe27c5a12dfa28fab
diff --git a/services/mediacodec/seccomp_policy/mediacodec-arm.policy b/services/mediacodec/seccomp_policy/mediacodec-arm.policy
index 52658d1..73857f8 100644
--- a/services/mediacodec/seccomp_policy/mediacodec-arm.policy
+++ b/services/mediacodec/seccomp_policy/mediacodec-arm.policy
@@ -67,3 +67,4 @@
 recvmsg: 1
 getpid: 1
 gettid: 1
+process_vm_readv: 1