configs: visionfive2: enable SPL_YMODEM_SUPPORT

We can use U-Boot for recovering JH7110 based boards via UART
if CONFIG_SPL_YMODEM_SUPPORT=y.

* Send u-boot-spl.normal.out via XMODEM.
* Send u-boot.itb via YMODEM.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: E. Shattow <lucent@gmail.com>
diff --git a/configs/starfive_visionfive2_defconfig b/configs/starfive_visionfive2_defconfig
index 3bbd1db..174ac24 100644
--- a/configs/starfive_visionfive2_defconfig
+++ b/configs/starfive_visionfive2_defconfig
@@ -62,6 +62,7 @@
 CONFIG_SPL_DM_SPI_FLASH=y
 CONFIG_SPL_DM_RESET=y
 CONFIG_SPL_SPI_LOAD=y
+CONFIG_SPL_YMODEM_SUPPORT=y
 CONFIG_SYS_PROMPT="StarFive # "
 CONFIG_CMD_EEPROM=y
 CONFIG_SYS_EEPROM_SIZE=512