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/arm/mach-socfpga/board.c b/arch/arm/mach-socfpga/board.c
index 7267163..b49006c 100644
--- a/arch/arm/mach-socfpga/board.c
+++ b/arch/arm/mach-socfpga/board.c
@@ -114,7 +114,7 @@
 #endif
 
 #if !IS_ENABLED(CONFIG_SPL_BUILD) && IS_ENABLED(CONFIG_FIT)
-void board_prep_linux(bootm_headers_t *images)
+void board_prep_linux(struct bootm_headers *images)
 {
 	if (!images->fit_uname_cfg) {
 		if (IS_ENABLED(CONFIG_SOCFPGA_SECURE_VAB_AUTH) &&