drm/amdgpu/mmhub3.0.2: add bounds checking for cid

drm/amdgpu/mmhub3.0.2: add bounds checking for cid

commit e5e6d67b1ce9764e67aef2d0eef9911af53ad99a upstream.

The value should never exceed the array size as those
are the only values the hardware is expected to return,
but add checks anyway.

Reviewed-by: Benjamin Cheng <benjamin.cheng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 1441f52c7f6ae6553664aa9e3e4562f6fc2fe8ea)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>