PCI: rcar: Remove PCI_PROBE_ONLY handling

The PCIe rcar host driver is not used in system configurations requiring
the PCI_PROBE_ONLY flag to be set to prevent resources assignment,
therefore the driver code handling the flag can be removed from the kernel.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Phil Edworthy <phil.edworthy@renesas.com>