drm/amdgpu: fix potential memory leak during navi12 deinitialization

stable inclusion
from stable-5.10.9
commit 279af879c3df88a08d0d40fd42108d13a48a7bdf
bugzilla: 47457

--------------------------------

[ Upstream commit e6d5c64e ]

Navi12 HDCP & DTM deinitialization needs continue to free bo if already
created though initialized flag is not set.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Jiawei Gu <Jiawei.Gu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>