ARM: shmobile: defconfig: Enable CAT9554 support

Enable support for the ON Semiconductor CAT9554 I2C I/O Expander, which
is used on the RSK+RZA1 board.

Signed-off-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: geertu

arch/arm/configs/shmobile_defconfig

@@ -89,6 +89,7 @@ CONFIG_PINCTRL_RZA1=y
 CONFIG_PINCTRL_RZA2=y
 CONFIG_GPIO_EM=y
 CONFIG_GPIO_RCAR=y
+CONFIG_GPIO_PCA953X=y
 CONFIG_GPIO_PCF857X=y
 CONFIG_POWER_RESET=y
 CONFIG_POWER_RESET_RMOBILE=y