Removing `keystore2_attest_symmetric_key_fail_sys_error` test.

Using ATTEST_KEY while generating symmetric key is unexpected. Removing
this test assuming this combination is never expected to be used.

Bug: 359743897
Bug: 361729305
Bug: 361373421
Bug: 336695416
Test: atest keystore2_client_tests
Change-Id: I783796fd9478b7f7f9270c9e78d9b12e28d955db
1 file changed