Add "default_min_sdk_version=19" to android gn args

Bug: chromium:1126469
Change-Id: Ia05590ef2e727ce3ac810610f579f6446682e8fa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2403242Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69828}

infra/mb/mb_config.pyl

@@ -586,7 +586,7 @@
 
   'mixins': {
     'android': {
-      'gn_args': 'target_os="android" v8_android_log_stdout=true',
+      'gn_args': 'target_os="android" v8_android_log_stdout=true default_min_sdk_version=19',
     },
 
     'android_strip_outputs': {