rockchip: rk3399: Drop altbootcmd

The defined altbootcmd was specific to distro_bootcmd which is not
longer in use on these platforms, so drop it.

Tested-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/rk3399_common.h b/include/configs/rk3399_common.h
index 04dcbf2..96ba19c 100644
--- a/include/configs/rk3399_common.h
+++ b/include/configs/rk3399_common.h
@@ -52,10 +52,7 @@
 	"fdtfile=" CONFIG_DEFAULT_FDT_FILE "\0" \
 	"partitions=" PARTS_DEFAULT \
 	ROCKCHIP_DEVICE_SETTINGS \
-	"boot_targets=" BOOT_TARGETS "\0" \
-	"altbootcmd=" \
-		"setenv boot_syslinux_conf extlinux/extlinux-rollback.conf;" \
-		"run distro_bootcmd\0"
+	"boot_targets=" BOOT_TARGETS "\0"
 
 #endif