ARM: configs: at91: sama5: enable SAMA5D2_PIOBU

Driver is enabled as a module.
Signed-off-by: Razvan Stefanescu <razvan.stefanescu@microchip.com>
Link: https://lore.kernel.org/r/20200325102223.24827-1-eugen.hristev@microchip.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/configs/sama5_defconfig

@@ -128,6 +128,7 @@ CONFIG_SPI=y
 CONFIG_SPI_ATMEL=y
 CONFIG_SPI_GPIO=y
 CONFIG_GPIO_SYSFS=y
+CONFIG_GPIO_SAMA5D2_PIOBU=m
 CONFIG_POWER_SUPPLY=y
 CONFIG_BATTERY_ACT8945A=y
 CONFIG_POWER_RESET=y