gpio/rockchip: rk_gpio support v2 gpio controller

The v2 gpio controller add write enable bit for some register,
such as data register, data direction register and so on.

This patch support v2 gpio

gpio/rockchip: rk_gpio support v2 gpio controller

The v2 gpio controller add write enable bit for some register,
such as data register, data direction register and so on.

This patch support v2 gpio controller by redefine the read and
write operation functions.

Change-Id: I2adbcca06a37c48e6f494b89833cd034ba0dae29
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>

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Merge git://git.denx.de/u-boot-rockchip

rockchip: gpio: Add rockchip GPIO driver

This supports RK3288 at present. It does not implement functions or support
for pull up/down.

Signed-off-by: Simon Glass <sjg@chromium.org>