PCI: rcar-host: Remove unneeded includes

Remove includes that are not needed, to speed up (re)compilation.

Most of these are relics from splitting the driver in a host and a
common part.

[bhelgaas: use driver tag analogous to rcar-ep]
Link: https://lore.kernel.org/r/54bed9a0e6991490ddb2b07e5abfaf40a7a62928.1633090577.git.geert+renesas@glider.be
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

drivers/pci/controller/pcie-rcar-host.c

@@ -24,13 +24,11 @@
 #include <linux/msi.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
-#include <linux/of_pci.h>
 #include <linux/of_platform.h>
 #include <linux/pci.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
-#include <linux/slab.h>
 
 #include "pcie-rcar.h"