drm/amdgpu: Decode deferred error type in aca bank parser

In the case of poison inband log, the error type need to be specified
by checking the deferred or poison bit of status register.

v2: check both deferred and poison bit

Signed-off-by: Xiang Liu <xiang.liu@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>