Remove the unused calchash djb2 hash function

Note that hashmap.c uses its own FNV-1a hash function

include/asm/util.h

@@ -11,8 +11,8 @@
 
 #include <stdint.h>
 
-uint32_t calchash(const char *s);
 char const *printChar(int c);
+
 /*
  * @return The number of bytes read, or 0 if invalid data was found
  */