vk: Query aperture size up front in anv_physical_device_init()

vk: Query aperture size up front in anv_physical_device_init()

We already query the device in various ways here and we can just also
get the aperture size.  This avoids keeping an extra drm fd open
during the life time of the driver.

Also, we need to use explicit 64 bit types for the aperture size, not
size_t.