move ARRAY_SIZE macro to types.h

The ARRAY_SIZE macro was defined in several target files, so move it
to types.h.

This patch also removes two other identical macros: DIM (from jtag.h)
and asizeof (from arm11.h).

src/target/embeddedice.c

@@ -30,8 +30,6 @@
 #include "embeddedice.h"
 #include "register.h"
 
-#define ARRAY_SIZE(x)	((int)(sizeof(x)/sizeof((x)[0])))
-
 /**
  * @file
  *