PCI: kirin: Select REGMAP_MMIO

pcie-kirin uses regmaps, and needs to pull them in; otherwise, with
CONFIG_PCIE_KIRIN=y and without CONFIG_REGMAP_MMIO pcie-kirin produces
a linker failure looking for __devm_regmap_init_mmio_clk().

Fixes: d19afe7 ("PCI: kirin: Use regmap for APB registers")
Link: https://lore.kernel.org/r/04636141da1d6d592174eefb56760511468d035d.1668410580.git.josh@joshtriplett.org
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
[lpieralisi@kernel.org: commit log and removed REGMAP select]
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: stable@vger.kernel.org # 5.16+

Author: joshtriplett

drivers/pci/controller/dwc/Kconfig

@@ -307,6 +307,7 @@ config PCIE_KIRIN
 	tristate "HiSilicon Kirin series SoCs PCIe controllers"
 	depends on PCI_MSI
 	select PCIE_DW_HOST
+	select REGMAP_MMIO
 	help
 	  Say Y here if you want PCIe controller support
 	  on HiSilicon Kirin series SoCs.