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/ls2081ardb_defconfig b/configs/ls2081ardb_defconfig
index bc2792e..7fcfdd4 100644
--- a/configs/ls2081ardb_defconfig
+++ b/configs/ls2081ardb_defconfig
@@ -8,6 +8,7 @@
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
 CONFIG_QSPI_BOOT=y
+CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_BOOTDELAY=10
 # CONFIG_CMD_IMLS is not set
 CONFIG_CMD_GREPENV=y
@@ -21,7 +22,6 @@
 CONFIG_OF_CONTROL=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_DM=y
-CONFIG_SCSI=y
 CONFIG_FSL_CAAM=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_NETDEVICES=y
@@ -30,6 +30,7 @@
 CONFIG_DM_PCI=y
 CONFIG_DM_PCI_COMPAT=y
 CONFIG_PCIE_LAYERSCAPE=y
+CONFIG_SCSI=y
 CONFIG_SYS_NS16550=y
 CONFIG_DM_SPI=y
 CONFIG_FSL_DSPI=y