mxs: enable LRADC driver

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

target/linux/mxs/config-4.14

@@ -201,7 +201,8 @@ CONFIG_JBD2=y
 CONFIG_LIBFDT=y
 CONFIG_MDIO_BUS=y
 CONFIG_MDIO_DEVICE=y
-# CONFIG_MFD_MXS_LRADC is not set
+CONFIG_MFD_CORE=y
+CONFIG_MFD_MXS_LRADC=y
 CONFIG_MIGHT_HAVE_PCI=y
 CONFIG_MMC=y
 CONFIG_MMC_BLOCK=y
@@ -210,7 +211,6 @@ CONFIG_MODULES_USE_ELF_REL=y
 # CONFIG_MTD_PHYSMAP_OF is not set
 CONFIG_MULTI_IRQ_HANDLER=y
 CONFIG_MXS_DMA=y
-CONFIG_MXS_LRADC=y
 CONFIG_MXS_TIMER=y
 CONFIG_NEED_DMA_MAP_STATE=y
 CONFIG_NEED_KUSER_HELPERS=y