ARM: dts: rockchip: Use ABI name for write protect pin on veyron fievel/tiger

ARM: dts: rockchip: Use ABI name for write protect pin on veyron fievel/tiger

The flash write protect pin is currently named 'FW_WP_AP', which is
how the signal is called in the schematics. The Chrome OS ABI
requires the pin to be named 'AP_FLASH_WP_L', which is also how
it is called on all other veyron devices. Rename the pin to match
the ABI.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20200106135142.1.I3f99ac8399a564c88ff48ae6290cc691b47c16ae@changeid
Signed-off-by: Heiko Stuebner <heiko@sntech.de>