[BACKPORT 1.16] drivers/gps: RTCM injection fixes

[dakejahl]

combines
#25698
#25697
#25696

[github-actions]

🔎 FLASH Analysis

px4_fmu-v5x [Total VM Diff: 184 byte (0.01 %)]

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px4_fmu-v6x [Total VM Diff: 168 byte (0.01 %)]

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--------------  -------------- 
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Updated: 2025-11-03T19:41:22

[DronecodeBot]

This pull request has been mentioned on Discussion Forum for PX4, Pixhawk, QGroundControl, MAVSDK, MAVLink. There might be relevant details there:

https://discuss.px4.io/t/px4-dev-call-nov-5-2025-team-sync-and-community-q-a/47812/1

[DronecodeBot]

This pull request has been mentioned on Discussion Forum for PX4, Pixhawk, QGroundControl, MAVSDK, MAVLink. There might be relevant details there:

https://discuss.px4.io/t/px4-dev-call-nov-19-2025-team-sync-and-community-q-a/47913/1

[DronecodeBot]

This pull request has been mentioned on Discussion Forum for PX4, Pixhawk, QGroundControl, MAVSDK, MAVLink. There might be relevant details there:

https://discuss.px4.io/t/px4-dev-call-nov-26-2025-team-sync-and-community-q-a/47984/1