Allow getrandom() in media.codec process

Test: Run camera-fast-front-back-switch.sh in the bug

Bug: 63907147
Change-Id: I65d3fe66d9cd9663e431db4a56bc66f6c06a0548
diff --git a/services/mediacodec/seccomp_policy/mediacodec-arm.policy b/services/mediacodec/seccomp_policy/mediacodec-arm.policy
index 52658d1..cbd7fb9 100644
--- a/services/mediacodec/seccomp_policy/mediacodec-arm.policy
+++ b/services/mediacodec/seccomp_policy/mediacodec-arm.policy
@@ -12,6 +12,7 @@
 dup: 1
 ppoll: 1
 mmap2: 1
+getrandom: 1
 
 # mremap: Ensure |flags| are (MREMAP_MAYMOVE | MREMAP_FIXED) TODO: Once minijail
 # parser support for '<' is in this needs to be modified to also prevent