spi: intel: Improve resource mapping

spi: intel: Improve resource mapping

Let's use the pci/platform-specialized functions for mapping a resource,
and pass the mapped address to intel_spi_probe. Benefits are:

- No separate call needed for getting the resource, and no access to
  struct pci_dev internals (pdev->resource[]).

- More user-friendly output in /proc/iomem. In my case:

  before
  80704000-80704fff : 0000:00:1f.5
    80704000-80704fff : 0000:00:1f.5 0000:00:1f.5

  after
  80704000-80704fff : 0000:00:1f.5
    80704000-80704fff : spi_intel_pci

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://patch.msgid.link/2585fa05-60c4-48c4-a838-e87014665ae2@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>