CQ: Remove android_clang as default trybot

Android has been building with Clang by default for quite some
time since the NDK has deprecated GCC. The bot will go away shortly.

TBR=fbarchard@chromium.org
NOTRY=True

Change-Id: Ie4d80daf7f91f55aa4a27089e725960c0646e051
Reviewed-on: https://chromium-review.googlesource.com/654997Reviewed-by: Henrik Kjellander <kjellander@chromium.org>
Commit-Queue: Henrik Kjellander <kjellander@chromium.org>

infra/config/cq.cfg

@@ -52,7 +52,6 @@ verifiers {
       builders { name: "linux_ubsan_vptr" }
       builders { name: "android" }
       builders { name: "android_rel" }
-      builders { name: "android_clang" }
       builders { name: "android_arm64" }
       builders { name: "android_x86" }
       builders { name: "android_x64" }