drv/ioport_lpf2: fix incorrect detection on Technic hub

It seems that the bootloader on the Technic hub must change the GPIO
pull from the default, so we need to explicitly set it during init.
Otherwise, ID2 is pulled low and devices are incorrectly detected.

Fixes: pybricks/support#230

lib/pbio/drv/ioport/ioport_lpf2.c

@@ -237,6 +237,15 @@ static void init_one(uint8_t ioport) {
     pbdrv_gpio_input(&pdata->uart_tx);
     pbdrv_gpio_input(&pdata->uart_rx);
 
+    // These should be set by default already, but it seems that the bootloader
+    // on the Technic hub changes these and causes wrong detection if we don't
+    // make sure pull is disabled.
+    pbdrv_gpio_set_pull(&pdata->id1, PBDRV_GPIO_PULL_NONE);
+    pbdrv_gpio_set_pull(&pdata->id2, PBDRV_GPIO_PULL_NONE);
+    pbdrv_gpio_set_pull(&pdata->uart_buf, PBDRV_GPIO_PULL_NONE);
+    pbdrv_gpio_set_pull(&pdata->uart_tx, PBDRV_GPIO_PULL_NONE);
+    pbdrv_gpio_set_pull(&pdata->uart_rx, PBDRV_GPIO_PULL_NONE);
+
     basic_devs[ioport].port = PBDRV_CONFIG_IOPORT_LPF2_FIRST_PORT + ioport;
     basic_devs[ioport].ops = &basic_dev_ops;
 }