ARM: multi_v7_defconfig: Add MCP23S08 pinctrl support

Enable MCP23S08 I/O expanders to manage Ethernet PHY
reset in STM32MP135F-DK board.
Signed-off-by: Christophe Roullier <christophe.roullier@foss.st.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Link: https://lore.kernel.org/r/20240705134407.2833659-1-alexandre.torgue@foss.st.comSigned-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/configs/multi_v7_defconfig

@@ -469,6 +469,7 @@ CONFIG_SPI_XILINX=y
 CONFIG_SPI_SPIDEV=y
 CONFIG_SPMI=y
 CONFIG_PINCTRL_AS3722=y
+CONFIG_PINCTRL_MCP23S08=m
 CONFIG_PINCTRL_MICROCHIP_SGPIO=y
 CONFIG_PINCTRL_OCELOT=y
 CONFIG_PINCTRL_PALMAS=y