dmaengine: idxd: Add idxd_pci_probe_alloc() helper

dmaengine: idxd: Add idxd_pci_probe_alloc() helper

Add the idxd_pci_probe_alloc() helper to probe IDXD PCI device with or
without allocating and setting idxd software values.

The idxd_pci_probe() function is refactored to call this helper and
always probe the IDXD device with allocating and setting the software
values.

This helper will be called later in the Function Level Reset (FLR)
process without modifying the idxd software data.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20241122233028.2762809-2-fenghua.yu@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>