apalis-imx8: provide proper config_sys_prompt

This provides correct system prompt for U-Boot console.

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
diff --git a/configs/apalis-imx8_defconfig b/configs/apalis-imx8_defconfig
index de33b25..125cd74 100644
--- a/configs/apalis-imx8_defconfig
+++ b/configs/apalis-imx8_defconfig
@@ -9,6 +9,7 @@
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="fsl-imx8qm-apalis"
 CONFIG_TARGET_APALIS_IMX8=y
+CONFIG_SYS_PROMPT="Apalis iMX8 # "
 CONFIG_SYS_LOAD_ADDR=0x80280000
 CONFIG_SYS_MEMTEST_START=0x88000000
 CONFIG_SYS_MEMTEST_END=0x89000000