board: tegra: convert boards to text env

Convert boards to use text based env. This is the first stage of
conversion, common inclusions should be converted next.

Acked-by: Francesco Dolcini <francesco.dolcini@toradex.com> # Toradex Apalis TK1
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

board/lenovo/ideapad-yoga-11/ideapad-yoga-11.env

@@ -0,0 +1,16 @@
+#include <env/nvidia/prod_upd.env>
+
+button_cmd_0_name=Volume Down
+button_cmd_0=bootmenu
+button_cmd_1_name=Lid sensor
+button_cmd_1=poweroff
+partitions=name=emmc,start=0,size=-,uuid=${uuid_gpt_rootfs}
+
+bootmenu_0=mount internal storage=usb start && ums 0 mmc 0; bootmenu
+bootmenu_1=mount external storage=usb start && ums 0 mmc 1; bootmenu
+bootmenu_2=fastboot=echo Starting Fastboot protocol ...; fastboot usb 0; bootmenu
+bootmenu_3=update bootloader=run update_spi
+bootmenu_4=reboot RCM=enterrcm
+bootmenu_5=reboot=reset
+bootmenu_6=power off=poweroff
+bootmenu_delay=-1