[build] Fix using goma on gcc builder

TBR=sergiyb@chromium.org
NOTRY=true

Bug: chromium:933093
Change-Id: Iaf703f9f9743c508c1f63301a74a1076286fab79
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1552792Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60637}

infra/mb/mb_config.pyl

@@ -524,7 +524,7 @@
     'release_x86_noembed_trybot': [
       'release_trybot', 'x86', 'v8_no_enable_embedded_builtins'],
     'release_x86_gcc': [
-      'release', 'static', 'x86', 'gcc'],
+      'release_bot', 'x86', 'gcc'],
     # TODO(machenbach): Enable back goma once supported.
     'release_x86_gcc_minimal_symbols': [
       'release', 'static', 'x86', 'gcc', 'minimal_symbols', 'no_goma'],