ARM: u8500_defconfig: update sensor config

The Ux500 is using buffered IIO as the sensors support
IRQs. The BH1780 ambient light sensor was added to IIO,
so disable the old misc driver and activate the driver
in IIO.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

arch/arm/configs/u8500_defconfig

@@ -45,7 +45,6 @@ CONFIG_DEVTMPFS=y
 CONFIG_DEVTMPFS_MOUNT=y
 CONFIG_BLK_DEV_RAM=y
 CONFIG_BLK_DEV_RAM_SIZE=65536
-CONFIG_SENSORS_BH1780=y
 CONFIG_NETDEVICES=y
 CONFIG_SMSC911X=y
 CONFIG_SMSC_PHY=y
@@ -106,8 +105,10 @@ CONFIG_DMADEVICES=y
 CONFIG_STE_DMA40=y
 CONFIG_HSEM_U8500=y
 CONFIG_IIO=y
+CONFIG_IIO_BUFFER=y
 CONFIG_IIO_ST_ACCEL_3AXIS=y
 CONFIG_IIO_ST_GYRO_3AXIS=y
+CONFIG_BH1780=y
 CONFIG_IIO_ST_MAGN_3AXIS=y
 CONFIG_IIO_ST_PRESS=y
 CONFIG_EXT2_FS=y