Convert CONFIG_ENV_IS_IN_SPI_FLASH to Kconfig
This converts the following to Kconfig:
CONFIG_ENV_IS_IN_SPI_FLASH
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/ethernut5_defconfig b/configs/ethernut5_defconfig
index 197052d..2bf06ad 100644
--- a/configs/ethernut5_defconfig
+++ b/configs/ethernut5_defconfig
@@ -2,6 +2,7 @@
CONFIG_ARCH_AT91=y
CONFIG_TARGET_ETHERNUT5=y
CONFIG_SYS_EXTRA_OPTIONS="AT91SAM9XE"
+CONFIG_ENV_IS_IN_SPI_FLASH=y
CONFIG_BOOTDELAY=3
# CONFIG_DISPLAY_BOARDINFO is not set
CONFIG_HUSH_PARSER=y