spi: bcm2835: reduce the abuse of the GPIO API

spi: bcm2835: reduce the abuse of the GPIO API

Currently the bcm2835 SPI driver uses functions that are available
exclusively to GPIO providers as a way to handle a platform quirk. Let's
use a slightly better alternative that avoids poking around in GPIOLIB's
internals and use GPIO lookup tables.

Link: https://www.spinics.net/lists/linux-gpio/msg36218.html
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230911161553.24313-1-brgl@bgdev.pl
Signed-off-by: Mark Brown <broonie@kernel.org>