Revert "arm: dts: Add pinctrl/GPIO/EINT node for mt2701"

This reverts commit 8ba671ef.

As reported by kbuild test robot <fengguang.wu@intel.com>:

   In file included from arch/arm/boot/dts/mt2701-evb.dts:16:0:
>> arch/arm/boot/dts/mt2701.dtsi:18:28: fatal error: mt2701-pinfunc.h: No such file or directory
    #include "mt2701-pinfunc.h"
                               ^

Signed-off-by: Arnd Bergmann <arnd@arndb.de>