dfu: define a callback function for the dfu_alt_info environment variable

I'm trying to use dfu-util for bootstrapping an stm32mp board. It
mostly works fine, but something goes horribly wrong as soon as I make
use of the ability to run arbitrary u-boot shell commands. The shell
commands themselves work fine, but the heuristic "dfu_alt_info may
have changed, we have to reinit" seems to cause the board and/or my
host machine to go into some bad state, and further dfu-util commands
fail.

U-Boot already has a mechanism whereby C code can be told about
changes to specific environment variables. So instead of always doing
re-init, add a hook to the dfu_alt_info variable so that we only do
set dfu_reinit_needed if the commands actually did modify that
variable.

Signed-off-by: Rasmus Villemoes <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mattijs Korpershoek <[email protected]>

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