autotest-tests-tpm: stop packaging platform_Attestation

This test item has been superseded by tast.hwsec.Attestation, so remove it.

BUG=b:154821616
TEST=none

Change-Id: I4a7f5dd211325a85536314b657056e054e3c450f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2255281
Auto-Submit: Ross Zwisler <zwisler@google.com>
Tested-by: Ross Zwisler <zwisler@google.com>
Reviewed-by: Katherine Threlkeld <kathrelkeld@chromium.org>
Commit-Queue: Ross Zwisler <zwisler@google.com>
diff --git a/chromeos-base/autotest-tests-tpm/autotest-tests-tpm-9999.ebuild b/chromeos-base/autotest-tests-tpm/autotest-tests-tpm-9999.ebuild
index 1ebcd01..13fe457 100644
--- a/chromeos-base/autotest-tests-tpm/autotest-tests-tpm-9999.ebuild
+++ b/chromeos-base/autotest-tests-tpm/autotest-tests-tpm-9999.ebuild
@@ -29,7 +29,6 @@
 	+tests_firmware_Cr50U2fPowerwash
 	+tests_hardware_TPMCheck
 	+tests_kernel_TPMStress
-	+tests_platform_Attestation
 	+tests_platform_Pkcs11InitUnderErrors
 	+tests_platform_Pkcs11ChangeAuthData
 	+tests_platform_Pkcs11Events