[MIPS] Remove remaining reference to ite_gpio.h from Kbuild

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

include/linux/Kbuild

@@ -100,7 +100,6 @@ header-y += ipx.h
 header-y += irda.h
 header-y += isdn_divertif.h
 header-y += iso_fs.h
-header-y += ite_gpio.h
 header-y += ixjuser.h
 header-y += jffs2.h
 header-y += keyctl.h