hal: Tock: Re-enable pin after detaching interrupt (#1308)

The Tock libtock_lora_phy_gpio_disable_interrupt() syscall will disable
interrupts for the pin, but also put the pin into a disabled low power
state. This isn't what RadioLib expects and casues subsequent LoRaWAN
transfers to fail [1].

So after we disable interrupts and send the pin to low power let's
re-enable inputs as RadioLib expects.

1: https://github.com/jgromes/RadioLib/discussions/1303

Signed-off-by: Alistair Francis <alistair@alistair23.me>

src/hal/Tock/libtockHal.h

@@ -154,6 +154,7 @@ class TockHal : public RadioLibHal {
 
       gpio_funcs[interruptNum - 1] = NULL;
       libtock_lora_phy_gpio_disable_interrupt(interruptNum);
+      libtock_lora_phy_gpio_enable_input(interruptNum, libtock_pull_down);
     }
 
     void delay(unsigned long ms) override {