spi: efm32: Convert to use GPIO descriptors
This switches the EFM32 driver over to use the GPIO descriptor handling in the core. The GPIO handling in this driver is pretty simplistic so this should just work. Drop the GPIO headers and insert the implicitly included <linux/of.h> header. Signed-off-by: NLinus Walleij <linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Cc: Uwe Kleine-König <u.kleine-koenig-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org> Link: https://lore.kernel.org/r/20200317094914.331932-1-linus.walleij@linaro.orgSigned-off-by: NMark Brown <broonie@kernel.org>
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