Felix Fietkau a145d0410b atheros: simplify gpiolib realization
Each SoCs generation has own independent gpiolib realization, so we
have no reason to keep these realizations in semiuniversal form.
Following modifications are made:
 * Remove valid_mask field
 * Remove ar231x_gpio_chip structure
 * Rename AR2315_GPIO_CR to AR2315_GPIO_DIR
 * Fix count of AR5312 GPIOs
 * Simplify gpio_chip methods realization

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>

SVN-Revision: 41696
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