sh: Add a machvec callback for early memblock reservations.

This adds in a callback to the machvec to allow platforms to do early
reservations through memblock.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/machvec.h

@@ -31,6 +31,7 @@ struct sh_machine_vector {
 	int (*mv_mode_pins)(void);
 
 	void (*mv_mem_init)(void);
+	void (*mv_mem_reserve)(void);
 };
 
 extern struct sh_machine_vector sh_mv;