Convert CONFIG_ENV_IS_IN_NVRAM to Kconfig

This converts the following to Kconfig:
   CONFIG_ENV_IS_IN_NVRAM

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/highbank_defconfig b/configs/highbank_defconfig
index 6f19492..d905b0f 100644
--- a/configs/highbank_defconfig
+++ b/configs/highbank_defconfig
@@ -3,6 +3,7 @@
 CONFIG_ARCH_HIGHBANK=y
 CONFIG_FIT=y
 CONFIG_OF_BOARD_SETUP=y
+CONFIG_ENV_IS_IN_NVRAM=y
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_HUSH_PARSER=y
@@ -23,6 +24,6 @@
 CONFIG_ISO_PARTITION=y
 CONFIG_EFI_PARTITION=y
 # CONFIG_PARTITION_UUIDS is not set
-CONFIG_SCSI=y
 # CONFIG_MMC is not set
+CONFIG_SCSI=y
 CONFIG_OF_LIBFDT=y