[build] Add MB config for new mips trybot

NOTRY=true
TBR=sergiyb@chromium.org

Change-Id: I285b32a5acbc302c29ca6085ab6998dbb1609539
Reviewed-on: https://chromium-review.googlesource.com/1013568
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52621}

infra/mb/mb_config.pyl

@@ -233,6 +233,7 @@
       'v8_mac64_dbg': 'debug_x64',
       'v8_mac64_dbg_ng': 'debug_x64',
       'v8_mac64_asan_rel': 'release_x64_asan_no_lsan',
+      'v8_mips_compile_rel': 'release_mips_no_snap_no_i18n',
       'v8_linux_arm_rel_ng': 'release_simulate_arm_trybot',
       'v8_linux_arm_dbg': 'debug_simulate_arm',
       'v8_linux_arm_armv8a_rel': 'release_simulate_arm_trybot',