arm: atmel: at91sam9x5: cleanup cs configure for spi
As the cs for spi is worked in gpio mode, so no need to configure it as peripheral and then configure to gpio. Configure it to gpio directly. Signed-off-by: NBo Shen <voice.shen@atmel.com> Signed-off-by: NAndreas Bießmann <andreas.devel@googlemail.com>
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