configs: am335x_hs_evm_uart: Add YMODEM SPL support for UART boot

UART booting requires YMODEM support. Add this here.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/am335x_hs_evm_uart_defconfig b/configs/am335x_hs_evm_uart_defconfig
index 379b958..419b41c 100644
--- a/configs/am335x_hs_evm_uart_defconfig
+++ b/configs/am335x_hs_evm_uart_defconfig
@@ -19,7 +19,6 @@
 # CONFIG_SPL_EXT_SUPPORT is not set
 CONFIG_SPL_MTD_SUPPORT=y
 # CONFIG_SPL_NAND_SUPPORT is not set
-# CONFIG_SPL_YMODEM_SUPPORT is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_NAND=y
 # CONFIG_CMD_SETEXPR is not set