Fix address-marking bugs

* Non-blocksize-aligned regions could fail to be found. Have the
  bootloader load them aligned.
* Consolidating used frame blocks in the bootstrap means these would
  have been impossible to free as address space
* mark_permanent wasn't actually removing blocks from the free list

src/libraries/kutil/include/kutil/address_manager.h

@@ -8,7 +8,7 @@ namespace kutil {
 
 using address_manager =
 	buddy_allocator<
-		16,  // Min allocation: 64KiB
+		12,  // Min allocation:  4KiB
 		36   // Max allocation: 64GiB
 	>;
 

src/libraries/kutil/include/kutil/buddy_allocator.h

@@ -132,6 +132,7 @@ public:
 		for (unsigned i = size_max; i >= size_min; --i) {
 			for (auto *r : free_bucket(i)) {
 				if (start >= r->address && end <= r->end()) {
+					free_bucket(i).remove(r);
 					delete_region(r, start, end);
 					return;
 				}