powerpc32: Limit memory to lowmem if !CONFIG_HIGHMEM.

This trims off the extra unusable memory from the lmb structure,
so we don't try to use it.
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/mm/init_32.c

@@ -154,10 +154,13 @@ void __init MMU_init(void)
 	 * in the fixed entries */
 	adjust_total_lowmem();
 #endif /* CONFIG_FSL_BOOKE */
+
 	if (total_lowmem > __max_low_memory) {
 		total_lowmem = __max_low_memory;
 #ifndef CONFIG_HIGHMEM
 		total_memory = total_lowmem;
+		lmb_enforce_memory_limit(total_lowmem);
+		lmb_analyze();
 #endif /* CONFIG_HIGHMEM */
 	}