radv: Avoid shader compilation during device creation.
More stuff to avoid timeouts on Android CTS, as we don't have a shader cache there.
Impacts:
dEQP-VK.api.object_management.multithreaded_per_thread_resources.device
dEQP-VK.api.object_management.multithreaded_per_thread_resources.device_group
dEQP-VK.api.object_management.multithreaded_shared_resources.device
dEQP-VK.api.object_management.multithreaded_shared_resources.device_group