tests/amdgpu: Fix TMZ secure bounce test
Fix the TMZ secure bounce test, in that Bob's buffer has to be created encrypted (with the encrypted flag set), so that when we copy from Alice's buffer, which is also encrypted, to Bob's buffer, the copy can be successful and the data actually copied.
This fixes the test and it no longer fails. Tested on Sienna Cichlid.
Signed-off-by: Luben Tuikov firstname.lastname@example.org