Allow uninstantiated WeaverTest

Add back GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST, which I had
accidentally removed while merging the AIDL and HIDL tests.  I think
this is still needed on devices that don't support Weaver at all.

Bug: 291284381
Test: atest VtsHalWeaverTargetTest
Change-Id: Iac1b4476620e51c645e3ad57444ee386cb879029
1 file changed