FIREWALL_CHAIN_OEM_DENY_x chains were added by aosp/2114533 but
corresponding blocked reasons were not added.
Upcoming aosp/3027488 updates CS to generate blocked reasons based on
bpf map contents.
Without blocked reasons for oem deny chains, onBlockedStatusChanged
callback will have inconsistency from the actual network blocked status.
This CL adds BLOCKED_REASON_OEM_DENY for FIREWALL_CHAIN_OEM_DENY_x chains
Bug: 328732146
Test: TH
Change-Id: I3793aa0e231d32fea5eb202ed69e170f74d66b02
9e75aad888