roc-rk3399-pc: Mark default env from SPI

Mark the default U-Boot environment as SPI flash since
this is an on board flash device.

Updated env offset, size in contrast with default since
the U-Boot proper has to start from 384K.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/roc-pc-rk3399_defconfig b/configs/roc-pc-rk3399_defconfig
index 76e76c1..6edd4a8 100644
--- a/configs/roc-pc-rk3399_defconfig
+++ b/configs/roc-pc-rk3399_defconfig
@@ -1,7 +1,9 @@
 CONFIG_ARM=y
 CONFIG_ARCH_ROCKCHIP=y
 CONFIG_SYS_TEXT_BASE=0x00200000
-CONFIG_ENV_OFFSET=0x3F8000
+CONFIG_ENV_SIZE=0x6000
+CONFIG_ENV_OFFSET=0x460000
+CONFIG_ENV_SECT_SIZE=0x1000
 CONFIG_ROCKCHIP_RK3399=y
 CONFIG_TARGET_ROC_PC_RK3399=y
 CONFIG_NR_DRAM_BANKS=1
@@ -24,7 +26,7 @@
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_DEFAULT_DEVICE_TREE="rk3399-roc-pc"
 CONFIG_OF_SPL_REMOVE_PROPS="pinctrl-0 pinctrl-names clock-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"
-CONFIG_ENV_IS_IN_MMC=y
+CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_ROCKCHIP_GPIO=y
 CONFIG_SYS_I2C_ROCKCHIP=y