impove memory accounting

. the total amount of memory in the system didn't include the memory
	  used by the boot-time modules and some dynamic allocation by the
	  kernel at boot time (to map in VM). especially apparent on our
	  ARM board with 'only' 512MB of memory and a huge ramdisk.
	. also: *add* the VM loaded module to the freelist after it has
	  been allocated for & mapped in instead of cutting it *out* of the
	  freelist! so we get a few more MB free..

Change-Id: If37ac32b21c9d38610830e21421264da4f20bc4f

kernel/arch/i386/pg_utils.c

@@ -81,6 +81,7 @@ phys_bytes alloc_lowest(kinfo_t *cbi, phys_bytes len)
 	}
 	assert(lowest != EMPTY);
 	cut_memmap(cbi, lowest, len);
+	cbi->kernel_allocated_bytes_dynamic += len;
 	return lowest;
 }
 
@@ -152,6 +153,8 @@ phys_bytes pg_alloc_page(kinfo_t *cbi)
 
 		mmap->len -= I386_PAGE_SIZE;
 
+                cbi->kernel_allocated_bytes_dynamic += I386_PAGE_SIZE;
+
 		return mmap->addr + mmap->len;
 	}