lora: sx126x: disable DIO1 in sleep mode

Disable the DIO1 interrupt when the sx126x modem is in sleep mode.
On nRF hardware, this lets the `GPIOTE` hardware be switched off, saving
15uA.

Fixes #31569.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
1 file changed