cxl/pci: Allocate irq vectors earlier during probe

Move the cxl_alloc_irq_vectors() call further up in the probing
in order to allow for mailbox interrupt usage. No change in
semantics.

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Link: https://lore.kernel.org/r/20230523170927.20685-3-dave@stgolabs.net


Signed-off-by: Dan Williams <dan.j.williams@intel.com>