85xx: Add cpu_mp_lmb_reserve helper to reserve boot page

Provide a board_lmb_reserve helper function to ensure we reserve
the page of memory we are using for the boot page translation code.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/cpu/mpc85xx/mp.h b/cpu/mpc85xx/mp.h
index b762ee2..4329286 100644
--- a/cpu/mpc85xx/mp.h
+++ b/cpu/mpc85xx/mp.h
@@ -4,6 +4,7 @@
 ulong get_spin_addr(void);
 void setup_mp(void);
 u32 get_my_id(void);
+void cpu_mp_lmb_reserve(struct lmb *lmb);
 
 #define BOOT_ENTRY_ADDR_UPPER	0
 #define BOOT_ENTRY_ADDR_LOWER	1