treewide: Drop bootm_headers_t typedef

This is not needed and we should avoid typedefs. Use the struct instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sh/lib/bootm.c b/arch/sh/lib/bootm.c
index 7ea0444..a5fad6c 100644
--- a/arch/sh/lib/bootm.c
+++ b/arch/sh/lib/bootm.c
@@ -40,7 +40,7 @@
 }
 
 int do_bootm_linux(int flag, int argc, char *const argv[],
-		   bootm_headers_t *images)
+		   struct bootm_headers *images)
 {
 	/* Linux kernel load address */
 	void (*kernel) (void) = (void (*)(void))images->ep;