spi: pl022: delete unused cur_gpiod in struct pl022

The member cur_gpiod of struct pl022 is not used anywhere. Delete it.

Signed-off-by: Nam Cao <namcao@linutronix.de>
Link: https://msgid.link/r/7618c9d714aa1c16c7cb06f9d1fb1c074d1d9c65.1702298527.git.namcao@linutronix.de


Signed-off-by: Mark Brown <broonie@kernel.org>