arm: am57xx: cl-som-am57x: change the shell prompt

Change the shell prompt to "U-Boot# ".

Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/cl-som-am57x_defconfig b/configs/cl-som-am57x_defconfig
index 13458da..bf753bc 100644
--- a/configs/cl-som-am57x_defconfig
+++ b/configs/cl-som-am57x_defconfig
@@ -7,6 +7,7 @@
 CONFIG_SPL=y
 # CONFIG_SPL_EXT_SUPPORT is not set
 CONFIG_HUSH_PARSER=y
+CONFIG_SYS_PROMPT="U-Boot# "
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMLS is not set
 CONFIG_CMD_ASKENV=y