m68k{,nommu}/h8300: Remove obsolete comment about map_chunk

Remove the comments referring to a function map_chunk that no longer exists.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
diff --git a/arch/h8300/mm/memory.c b/arch/h8300/mm/memory.c
index ccd6ade..40d8aa8 100644
--- a/arch/h8300/mm/memory.c
+++ b/arch/h8300/mm/memory.c
@@ -44,8 +44,8 @@
 {
 }
 
-/* Map some physical address range into the kernel address space. The
- * code is copied and adapted from map_chunk().
+/*
+ * Map some physical address range into the kernel address space.
  */
 
 unsigned long kernel_map(unsigned long paddr, unsigned long size,