v3dv: re-enable sync_fd import/export on the simulator

v3dv: re-enable sync_fd import/export on the simulator

On commit 29588fe11667 we re-enable sync_fd import/export. But only
with the real hw, because at that time there were wrong CTS tests
(that were calling vkSetEvent after submission) that needed to be
fixed.

Since this commit:
https://github.com/KhronosGroup/VK-GL-CTS/commit/717c051d4bcc9b71f13bc6b223e9926dcf9b7bd5

Those tests are fixed. That fix has been on CTS releases for some
time. So we can enable it on the simulator too.

With this change the pattern dEQP-VK.api.external.semaphore.sync_fd*
goes from 2 Passed/10 Not Supported to 12 Passed on the simulator.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24688>