Add BPF_MAP_LOCKLESS_FOR_TEST hack for root resolver tests

Per commit description of https://android-review.git.corp.google.com/c/platform/packages/modules/Connectivity/+/3109108 "Use SingleWriterBpfMap in BpfNetMaps":

- firewall.cpp writes to sConfigurationMap, sUidOwnerMap, and
  sDataSaverEnabledMap, but that code only runs in tests because
  it requires root privileges.

So either those maps need to not use SingleWriterBpfMap
in the BpfNetMaps (which would affect performance),
or we need to prevent the tests from grabbing the locks,
or the tests will (presumably) fail.

This avoids grabbing the locks from the test, even though
this is absolutely terrible and likely breaks things...
But in general the entire firewall.cpp file (and libconnectivity_native_test_utils target) are just one
large modularization violation in need of major escalation...

Test via:
  atest resolv_{gold,stress,integration,unit}_test

Without this patch:
  resolv_gold_test: Passed: 16
  resolv_integration_test: Passed: 53, Failed: 2, Ignored: 118, Assumption Failed: 0 (Completed With ERRORS)
  resolv_stress_test: Passed: 2
  resolv_unit_test: Passed: 124, Failed: 2

  4 tests failed
  --------------
  ResolverMultinetworkTest#DnsWithVpn
  PrivateDns/TransportParameterizedTest#BlockDnsQuery/DoT
  CallbackTest#tagSocketCallback
  ResolvGetAddrInfoTest#InvalidParameters

With this patch:
  resolv_gold_test: Passed: 16
  resolv_integration_test: Passed: 178
  resolv_stress_test: Passed: 2
  resolv_unit_test: Passed: 126

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ie97d015ef66c3864a23484e7ed190fe7d091af5c

staticlibs/native/bpf_syscall_wrappers/include/BpfSyscallWrappers.h

@@ -135,6 +135,9 @@ int bpfGetFdMapId(const BPF_FD_TYPE map_fd);
 
 inline int bpfLock(int fd, short type) {
     if (fd < 0) return fd;  // pass any errors straight through
+#ifdef BPF_MAP_LOCKLESS_FOR_TEST
+    return fd;
+#endif
 #ifdef BPF_FD_JUST_USE_INT
     int mapId = bpfGetFdMapId(fd);
     int saved_errno = errno;

tests/native/utilities/firewall.h

@@ -18,6 +18,7 @@
 #pragma once
 
 #include <android-base/thread_annotations.h>
+#define BPF_MAP_LOCKLESS_FOR_TEST
 #include <bpf/BpfMap.h>
 #include "netd.h"