Put cinfo array into initdata section. Added more precision in bootmem

cinfo array is now freed along with other init memory.
bootmem allocator memory is reduced to be completely used up.
free boot memory now prints the used free memory as well.

include/l4/generic/bootmem.h

@@ -5,6 +5,7 @@
 #ifndef __BOOTMEM_H__
 #define __BOOTMEM_H__
 
+unsigned long bootmem_free_pages(void);
 void *alloc_bootmem(int size, int alignment);
 pmd_table_t *alloc_boot_pmd(void);