v3dv/bo: reset bo and then call gem close

v3dv/bo: reset bo and then call gem close

After 'v3dv: fix debug dump on BO free' we changed the order, and this
lead to the following test
dEQP-VK.api.object_management.multithreaded_per_thread_resources.device_memory_small

v2: Expanded comment just before the reset, explaining that we need to
do the reset before we free the BO from the kernel (Iago)

Raising this assertion:
deqp-vk: ../src/broadcom/vulkan/v3dv_bo.c:281: v3dv_bo_alloc: Assertion `bo && bo->handle == 0' failed.

Fixes: 2c44597181e2 ('v3dv: fix debug dump on BO free')

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19693>
(cherry picked from commit ec1cdc13d5cf6026692bf3765be3aeceb511e6d6)