gralloc4-vts: setting USAGE is always BAD_VALUE

Usage cannot be change after allocation. Mapper must return
BAD_VALUE. SetConstantMetadata already tests this. Remove
the tests that attempted to set USAGE and expected it could
succeed.

Test: VtsHalGraphicsMapperV4_0
Bug: 149830560

Change-Id: I730dd3f3c0c48946c436e8fb60256365e0d9ab1e