bootm: Tidy up boot_selected_os()

Use struct bootm_info with this function, to avoiding needing to
create a new one.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/bootm.h

@@ -91,8 +91,7 @@ boot_os_fn *bootm_os_get_boot_func(int os);
 int bootm_host_load_images(const void *fit, int cfg_noffset);
 #endif
 
-int boot_selected_os(int argc, char *const argv[], int state,
-		     struct bootm_headers *images, boot_os_fn *boot_fn);
+int boot_selected_os(int state, struct bootm_info *bmi, boot_os_fn *boot_fn);
 
 ulong bootm_disable_interrupts(void);