Revert "Add vector type hint to phatk kernel."

This reverts commit 27a6f7a81b.

Has no demonstrable beneficial effect on phatk kernel.

phatk120223.cl

@@ -153,7 +153,6 @@ __constant uint H[8] = {
 #define MAXBUFFERS (4095)
 
 __kernel 
-__attribute__((vec_type_hint(u)))
  __attribute__((reqd_work_group_size(WORKSIZE, 1, 1)))
 void search(	const uint state0, const uint state1, const uint state2, const uint state3,
 						const uint state4, const uint state5, const uint state6, const uint state7,