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/M54418TWR_serial_rmii_defconfig b/configs/M54418TWR_serial_rmii_defconfig
index 3445394..bf0b34f 100644
--- a/configs/M54418TWR_serial_rmii_defconfig
+++ b/configs/M54418TWR_serial_rmii_defconfig
@@ -2,6 +2,7 @@
CONFIG_SYS_TEXT_BASE=0x47E00000
CONFIG_TARGET_M54418TWR=y
CONFIG_SYS_EXTRA_OPTIONS="CF_SBF,SYS_SERIAL_BOOT,SYS_INPUT_CLKSRC=50000000"
+CONFIG_ENV_IS_IN_SPI_FLASH=y
# CONFIG_DISPLAY_BOARDINFO is not set
CONFIG_HUSH_PARSER=y
CONFIG_SYS_PROMPT="-> "