dfu: Drop unused prototype of dfu_trigger_reset()

After the commit 1cc03c5c53c0 ("dfu: Provide means to find difference between
dfu-util -e and -R") the dangling ptototype appeared. Remove it here.

Fixes: 1cc03c5c53c0 ("dfu: Provide means to find difference between dfu-util -e and -R")
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Lukasz Majewski <lukma@denx.de>
diff --git a/include/dfu.h b/include/dfu.h
index 5649663..2e3e91c 100644
--- a/include/dfu.h
+++ b/include/dfu.h
@@ -171,7 +171,6 @@
 const char *dfu_get_layout(enum dfu_layout l);
 struct dfu_entity *dfu_get_entity(int alt);
 char *dfu_extract_token(char** e, int *n);
-void dfu_trigger_reset(void);
 int dfu_get_alt(char *name);
 int dfu_init_env_entities(char *interface, char *devstr);
 unsigned char *dfu_get_buf(struct dfu_entity *dfu);