spi: efm32: Clean up non-DT paths
This is a DT-only driver, so remove all non-DT paths. of_gpio_named_count() may fail, thus also add checking it's return value. efm32_spi_probe_dt() never fails, make it return void. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Mark Brown <broonie@linaro.org>
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