ARM: shmobile: kzm9g_defconfig: Update AK8975 config option

CONFIG_SENSORS_AK8975 was renamed to CONFIG_AK8975 in commit
2fc72cd8 ("iio:magnetometer:ak8975 move driver out of staging")
in v3.10.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/configs/kzm9g_defconfig

@@ -126,8 +126,8 @@ CONFIG_DMADEVICES=y
 CONFIG_SH_DMAE=y
 CONFIG_ASYNC_TX_DMA=y
 CONFIG_STAGING=y
-CONFIG_SENSORS_AK8975=y
 CONFIG_IIO=y
+CONFIG_AK8975=y
 # CONFIG_DNOTIFY is not set
 CONFIG_VFAT_FS=y
 CONFIG_TMPFS=y