build: add helper/types.h to config.h

this header is used in numerous files and adding to config.h
simplifies its use globally.

Change-Id: Id724a9950b90504721233022c7fb5768e9bc5548
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/649
Tested-by: jenkins
Reviewed-by: Xiaofan <xiaofanc@gmail.com>

src/pld/xilinx_bit.h

@@ -21,8 +21,6 @@
 #ifndef XILINX_BIT_H
 #define XILINX_BIT_H
 
-#include <helper/types.h>
-
 struct xilinx_bit_file {
 	uint8_t unknown_header[13];
 	uint8_t *source_file;