ARM: socfpga_defconfig: enable LTC2497

Enable the LTC2497 driver to support the two LTC2497's that are on
the SoCFPGA Arria10 Devkit.
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm/configs/socfpga_defconfig

@@ -126,6 +126,8 @@ CONFIG_RTC_DRV_DS1307=y
 CONFIG_DMADEVICES=y
 CONFIG_PL330_DMA=y
 CONFIG_DMATEST=m
+CONFIG_IIO=y
+CONFIG_LTC2497=y
 CONFIG_FPGA=y
 CONFIG_FPGA_MGR_SOCFPGA=y
 CONFIG_FPGA_MGR_SOCFPGA_A10=y