arm64: defconfig: Enable PCF857X GPIO expander

Enable the PCF857X GPIO expander which is equipped on
the PHYTEC phyBOARD-Lyra AM625.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Link: https://lore.kernel.org/r/20241003063642.2710384-1-w.egorov@phytec.de
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>

Author: wdmegrv

arch/arm64/configs/defconfig

@@ -659,6 +659,7 @@ CONFIG_GPIO_MAX732X=y
 CONFIG_GPIO_PCA953X=y
 CONFIG_GPIO_PCA953X_IRQ=y
 CONFIG_GPIO_ADP5585=m
+CONFIG_GPIO_PCF857X=m
 CONFIG_GPIO_BD9571MWV=m
 CONFIG_GPIO_MAX77620=y
 CONFIG_GPIO_SL28CPLD=m