[leoleovich]

Fix GNSS receiver reset on every restart when RTCM is enabled

When gnss-rtcm-enabled=true, gnss_set_rtcm_config() persists RTCM message rates to Flash. On next startup, check_gnss_config_in_ram() compares the receiver's current state against the base config which expects RTCM rates = 0. This mismatch triggers a full 571-key reconfiguration + hardware reset every time, causing ~25 minutes of GPS fix loss.

Fix: patch the reference config array to include RTCM rates = 1 before comparison when RTCM is enabled, following the same pattern used by set_cable_delay() and set_preferred_time_scale().

Before

INFO  Using custom value for "gnss-cable-delay": 672
DEBUG Config (CFG-MSGOUT-RTCM_3X_TYPE1005_UART1 (0x209102be, U1) = 0) differs from current config (CFG-MSGOUT-RTCM_3X_TYPE1005_UART1 (0x209102be, U1) = 1)
DEBUG Config (CFG-MSGOUT-RTCM_3X_TYPE1077_UART1 (0x209102cd, U1) = 0) differs from current config (CFG-MSGOUT-RTCM_3X_TYPE1077_UART1 (0x209102cd, U1) = 1)
DEBUG Config (CFG-MSGOUT-RTCM_3X_TYPE1087_UART1 (0x209102d2, U1) = 0) differs from current config (CFG-MSGOUT-RTCM_3X_TYPE1087_UART1 (0x209102d2, U1) = 1)
DEBUG Config (CFG-MSGOUT-RTCM_3X_TYPE1097_UART1 (0x20910319, U1) = 0) differs from current config (CFG-MSGOUT-RTCM_3X_TYPE1097_UART1 (0x20910319, U1) = 1)
DEBUG Config (CFG-MSGOUT-RTCM_3X_TYPE1127_UART1 (0x209102d7, U1) = 0) differs from current config (CFG-MSGOUT-RTCM_3X_TYPE1127_UART1 (0x209102d7, U1) = 1)
DEBUG Config (CFG-MSGOUT-RTCM_3X_TYPE1230_UART1 (0x20910304, U1) = 0) differs from current config (CFG-MSGOUT-RTCM_3X_TYPE1230_UART1 (0x20910304, U1) = 1)
INFO  Receiver not configured to desired configuration, starting reconfiguration
INFO  Configuring receiver with ART parameters...
      rx0: Sending 571 key-value pairs in 10 UBX-CFG-VALSET messages
      ...
INFO  Successfully reconfigured GNSS receiver
DEBUG Performing hardware reset
      rx0: Doing receiver reset: Hardware reset
      <GPS fix lost, ~25min recovery>

After

INFO  Using custom value for "gnss-cable-delay": 672
INFO  RTCM output enabled in base configuration for comparison
INFO  Receiver already configured to desired configuration
      rx0: Sending UBX-CFG-VALSET 1/1 (7 items: 1..7/7, 47 bytes, RAM,BBR,Flash, no transaction)
INFO  RTCM3 output enabled on UART1 (6 messages configured)
INFO  RTCM socket listening at /run/oscillatord/rtcm.sock
      <GPS retains fix, 32 satellites, no recovery needed>

[ESoapW]

CI failure here is unrelated to this PR. ubloxcfg_gen.pl needs Path::Tiny (and Data::Float) which aren't on ubuntu-latest. Whether the perl runs at all depends on cmake's timestamp check on the committed generated files, so it's flaky, #148 got lucky, this one didn't.
Fix: add below before cmake in build-oscillatord.yaml:

- name: Install perl modules for ubloxcfg code-gen
  run: sudo apt-get update && sudo apt-get install -y libpath-tiny-perl libdata-float-perl