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 <rasmus.villemoes@prevas.dk>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20240911133900.1444083-1-rasmus.villemoes@prevas.dk
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

include/env_callback.h

@@ -69,6 +69,12 @@
 #define BOOTSTD_CALLBACK
 #endif
 
+#ifdef CONFIG_DFU
+#define DFU_CALLBACK "dfu_alt_info:dfu_alt_info,"
+#else
+#define DFU_CALLBACK
+#endif
+
 /*
  * This list of callback bindings is static, but may be overridden by defining
  * a new association in the ".callbacks" environment variable.
@@ -79,6 +85,7 @@
 	NET_CALLBACKS \
 	NET6_CALLBACKS \
 	BOOTSTD_CALLBACK \
+	DFU_CALLBACK \
 	"loadaddr:loadaddr," \
 	SILENT_CALLBACK \
 	"stdin:console,stdout:console,stderr:console," \