Convert CONFIG_FSL_QIXIS et al to Kconfig

This converts the following to Kconfig:
   CONFIG_FSL_QIXIS
   CONFIG_QIXIS_I2C_ACCESS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/lx2160ardb_tfa_defconfig b/configs/lx2160ardb_tfa_defconfig
index b2c95e7..1448cf4 100644
--- a/configs/lx2160ardb_tfa_defconfig
+++ b/configs/lx2160ardb_tfa_defconfig
@@ -18,6 +18,7 @@
 CONFIG_VID_FLS_ENV="lx2160ardb_vdd_mv"
 CONFIG_VOL_MONITOR_LTC3882_READ=y
 CONFIG_VOL_MONITOR_LTC3882_SET=y
+CONFIG_FSL_QIXIS=y
 CONFIG_EMC2305=y
 CONFIG_FSPI_AHB_EN_4BYTE=y
 CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT=y