The 'base' GPIO controller property is unused in u-boot and Linux. It is
also not documented in the binding. So drop it.
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Acked-by: Jassi Brar <jaswinder.singh@linaro.org>