Add linux-lacros-rel to mb_config.pyl

Previously tryjob failed with:
MBErr: Builder name "linux-lacros-rel"  not found under masters[tryserver.chromium.linux] in "/b/s/w/ir/cache/builder/src/tools/mb/mb_config.pyl"

Bug: 1104291
Change-Id: I1a4b1cb2a306a0d1562da1a0d4e712adfd852cab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304311
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789380}

tools/mb/mb_config.pyl

@@ -24,7 +24,6 @@
       # they monitor binary size growth, which may be affected by the tables.
       'linux-chrome': 'official_goma',
       'linux-chromeos-chrome': 'official_goma_chromeos',
-      'linux-lacros': 'lacros_on_linux_release_bot',
       'mac-chrome': 'official_goma',
       'mac-chrome-beta': 'official_goma',
       'mac-chrome-stable': 'official_goma',
@@ -879,6 +878,7 @@
       'linux-clang-tidy-rel': 'release_trybot',
       'linux-dcheck-off-rel': 'release_trybot_dcheck_off',
       'linux-gcc-rel': 'release_bot_x86_minimal_symbols_no_clang_cxx11',
+      'linux-lacros-rel': 'lacros_on_linux_release_bot',
       'linux-libfuzzer-asan-rel': 'libfuzzer_asan_release_trybot',
       'linux-ozone-rel': 'ozone_linux_release_trybot',
       'linux-perfetto-rel': 'perfetto_release_trybot',