Re: at86rf230: Allow slow GPIO pins for "rstn"

[Nikita Yushchenko]

> Driver code never touches "rstn" signal in atomic context, so there's
> no need to implicitly put such restriction on it by using gpio_set_value
> to manipulate it. Replace gpio_set_value to gpio_set_value_cansleep to
> fix that.
> 
> As a an example of where such restriction might be inconvenient,
> consider a hardware design where "rstn" is connected to a pin of I2C/SPI
> GPIO expander chip.
> 
> Cc: Chris Healy <cphealy@xxxxxxxxx>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>

Reviewed-by: Nikita Yushchenko <nikita.yoush@xxxxxxxxxxxxxxxxxx>