rockchip: rockpro64: Store default env into SPI

Board has flash chip on board so let store U-Boot environment there.

Signed-off-by: Marcin Juszkiewicz <marcin@juszkiewicz.com.pl>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/rockpro64-rk3399_defconfig b/configs/rockpro64-rk3399_defconfig
index 23eacdd..227503e 100644
--- a/configs/rockpro64-rk3399_defconfig
+++ b/configs/rockpro64-rk3399_defconfig
@@ -1,6 +1,7 @@
 CONFIG_ARM=y
 CONFIG_ARCH_ROCKCHIP=y
 CONFIG_SYS_TEXT_BASE=0x00200000
+CONFIG_ENV_SIZE=0x8000
 CONFIG_ENV_OFFSET=0x3F8000
 CONFIG_ROCKCHIP_RK3399=y
 CONFIG_TARGET_ROCKPRO64_RK3399=y
@@ -25,7 +26,7 @@
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_DEFAULT_DEVICE_TREE="rk3399-rockpro64"
 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