Revert "Pick worksize 256 with Cypress if none is specified."

This reverts commit 482322a4b7.

Worksize 256 was only helpful on cypress with ultra-low memory speeds with old SDKs and the new kernels require higher memory clocks, having the opposite net effect.

ocl.c

@@ -468,12 +468,8 @@ _clState *initCl(unsigned int gpu, char *name, size_t nameSize)
 		clState->wsize = cgpu->work_size;
 	else if (strstr(name, "Tahiti"))
 		clState->wsize = 64;
-	else {
-		if (strstr(name, "Cypress"))
-			clState->wsize = 256;
 	else
 		clState->wsize = (clState->max_work_size <= 256 ? clState->max_work_size : 256) / clState->vwidth;
-	}
 	cgpu->work_size = clState->wsize;
 
 #ifdef USE_SCRYPT