[FER] Make the u-blox library GNSS example fit for demonstration

[rexut]

Is your enhancement proposal related to a problem? Please describe.
I as an system engineer wants to see a proper solution of the existent Bridle sample ubx_gnss that will build and run out-of-the-box for the following completely different platforms (SOCs):

• Nordic nRF9160 DK (nRF9160)
• Nordic nRF52840 DK (nRF52840)
• ST Nucleo L496ZG
• ST Nucleo F413ZH
• ST Nucleo F767ZI
• NXP MIMXRT1170-EVKB (CM7)
• NXP MIMXRT1060-EVK
• NXP MIMXRT1010-EVK

Describe the solution you'd like

1. Adapt app.overlay to use the commonly used Arduino signal D8 for module reset.
2. Setup the Arduino UART (&arduino_serial) properly to use 9600Bd per default and set status to "okay".
3. Add board specific Kconfig artefacts and/or DTS overlays on demand
4. Extend the documentation.

Describe alternatives you've considered
Non.

Additional context
Non.