wizchip_reset() does not fully configure GPIO

[AmeNote-Michael]

The routine wizchip_reset() in w5x00_spi.c does not properly configure the GPIO used to reset the wisnet chip leaving it to randomly work. Need to make sure to perform a gpio_init(PIN_RST) before setting direction and using. Below is example code of how I fixed this issue.

void wizchip_reset()
{
    static bool isConfigured = false;

    if ( !isConfigured )
    {
        gpio_init(PIN_RST);     // Initialize as a GPIO
        gpio_set_dir(PIN_RST, GPIO_OUT);    // Configure as an output
        isConfigured = true;
    }

    gpio_put(PIN_RST, 0);
    sleep_ms(100);

    gpio_put(PIN_RST, 1);
    sleep_ms(100);

    bi_decl(bi_1pin_with_name(PIN_RST, "W5x00 RESET"));
}