Add blocked reason for OEM deny firewall chains

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
3 files changed