PCI: dwc-plat: Drop unused regmap pointer

1d906b22 ("PCI: dwc: Add support for EP mode") added the struct
dw_plat_pcie regmap pointer, but it has never been used.  Remove it.

[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20220624143428.8334-18-Sergey.Semin@baikalelectronics.ruTested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>

drivers/pci/controller/dwc/pcie-designware-plat.c

@@ -17,13 +17,11 @@
 #include <linux/platform_device.h>
 #include <linux/resource.h>
 #include <linux/types.h>
-#include <linux/regmap.h>
 
 #include "pcie-designware.h"
 
 struct dw_plat_pcie {
 	struct dw_pcie			*pci;
-	struct regmap			*regmap;
 	enum dw_pcie_device_mode	mode;
 };