evb_rk3399: revert CONFIG_SYS_MMC_ENV_DEV to 0

This was changed to 1 in commit 0717dde057e, but a few months later,
commit 5f9411af37b swapped the order of eMMC and SD card by assigning
indexed aliases to `&sdhci` and `&sdmmc`.

Signed-off-by: Max Kellermann <max.kellermann@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
(Add signature)
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
1 file changed