Convert CONFIG_LAYERSCAPE_NS_ACCESS to Kconfig

This converts the following to Kconfig:
   CONFIG_LAYERSCAPE_NS_ACCESS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1021atwr_qspi_defconfig b/configs/ls1021atwr_qspi_defconfig
index aadc61b..e186dfe 100644
--- a/configs/ls1021atwr_qspi_defconfig
+++ b/configs/ls1021atwr_qspi_defconfig
@@ -15,6 +15,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="ls1021a-twr-duart"
 CONFIG_SYS_LOAD_ADDR=0x82000000
 CONFIG_AHCI=y
+CONFIG_LAYERSCAPE_NS_ACCESS=y
 CONFIG_SYS_MEMTEST_START=0x80000000
 CONFIG_SYS_MEMTEST_END=0x9fffffff
 CONFIG_DISTRO_DEFAULTS=y