cheets_GTS: GtsIncrementalInstallProxyHostTestCases has no-test on P.

It was masked by the error b/166052755, but regardless
or not the GTS bug is fixed, all the tests in this
modules are skipped on Android P. Let's mark it as so.

BUG=b:68021674
TEST=cheets_GTS.8.0_r1.GtsIncrementalInstall on Scarlet

Change-Id: I64266b9c77d12fc01dd61be4aa95236bbc39f464
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2430530
Reviewed-by: Kazuhiro Inaba <kinaba@chromium.org>
Commit-Queue: Kazuhiro Inaba <kinaba@chromium.org>
Tested-by: Kazuhiro Inaba <kinaba@chromium.org>
Auto-Submit: Kazuhiro Inaba <kinaba@chromium.org>
diff --git a/server/site_tests/cheets_GTS/notest_modules/notest_modules.yaml b/server/site_tests/cheets_GTS/notest_modules/notest_modules.yaml
index 297655c..3c718fc 100644
--- a/server/site_tests/cheets_GTS/notest_modules/notest_modules.yaml
+++ b/server/site_tests/cheets_GTS/notest_modules/notest_modules.yaml
@@ -9,6 +9,7 @@
 GtsIncident: [all]
 GtsIncidentConfirmationTestCases: [all]
 GtsIncidentManagerTestCases: [all]
+GtsIncrementalInstallProxyHostTestCases: [all]
 GtsInstallerV2TestCases: [all]
 GtsMemory: [all]
 GtsMemoryHostTestCases: [all]