hush: Add rudimentary support for PS1 and PS2
Add trivial support for changing the U-Boot command prompt string by setting PS1 and PS2 environment variables. Only static variables are supported. Signed-off-by: NMarek Vasut <marex@denx.de> Reviewed-by: NHeiko Schocher <hs@denx.de> Reviewed-by: NSimon Glass <sjg@chromium.org>
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