[riot-notifications] [RIOT-OS/RIOT] drivers/sx127x: add gpio pull config define for DIO pins (#11132)

MichelRottleuthner notifications at github.com
Thu Mar 7 16:35:07 CET 2019

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### Contribution description
When testing #11022 I discovered that from time to time some spurious interrupts are triggered.
This adds a define to the sx127x driver that sets the gpios of the DIO pins to pull down by default because 
many lora modules actually come without pull resistors equipped (e.g. [I-NUCLEO-SX1272D](https://www.st.com/en/evaluation-tools/i-nucleo-sx1272d.html), [SX1276MB1xAS](https://os.mbed.com/components/SX1276MB1xAS/), [DRF1272F](https://www.tindie.com/products/DORJI_COM/868mhz-lora-sx1272-module-drf1272f/))

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### Testing procedure
Flash tests/pkg_semtech-loramac on some nucleo board with one of the above mdules connected and either leave it running for some hours or provoke an interrupt by touching the DIO3 Pin (aka PB4 or PWM//D5 on nucle64 boards).
Because of another bug in the driver this actually triggers a hardfault/reset.

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### Issues/PRs references
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-- Commit Summary --

  * drivers/sx127x: add gpio pull config define for DIO pins

-- File Changes --

    M drivers/include/sx127x.h (3)
    M drivers/sx127x/sx127x.c (20)

-- Patch Links --


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