pinctrl: realtek: Select REGMAP_MMIO for RTD driver

The pinctrl-rtd driver uses 'devm_regmap_init_mmio', which requires
'REGMAP_MMIO' to be enabled.

Without this selection, the build fails with an undefined reference:
aarch64-none-linux-gnu-ld: drivers/pinctrl/realtek/pinctrl-rtd.o: in
function rtd_pinctrl_probe': pinctrl-rtd.c:(.text+0x5a0): undefined
reference to __devm_regmap_init_mmio_clk'

Fix this by selecting 'REGMAP_MMIO' in the Kconfig.

Fixes: e99ce78 ("pinctrl: realtek: Add common pinctrl driver for Realtek DHC RTD SoCs")
Signed-off-by: Yu-Chun Lin <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

Author: Yu-Chun Lin

drivers/pinctrl/realtek/Kconfig

@@ -6,6 +6,7 @@ config PINCTRL_RTD
 	default y
 	select PINMUX
 	select GENERIC_PINCONF
+	select REGMAP_MMIO
 
 config PINCTRL_RTD1619B
 	tristate "Realtek DHC 1619B pin controller driver"