[quectel][msom] re-enable 2G support for M404, fix for M524

[technobly]

Problem

• 2G support was disabled for M-SoM temporarily due to some issues with operation on M524

Solution

• Re-enable and test on M404 and M524 for correct operation
• Added isQuec2g3gEnabled() helper function to determine which devices use CREG/CGREG AT commands and need nwscanmode set to AUTO. Also used to exclude BG96 from having 2G enabled.
• nwscanseq still isolated to M-SoM
• interveneRegistration() function now processed for Cat1 / 2g3g / Cat-M1 devices explicitly
• Note: EG91xxx devices were relying on factory defaults for nwscanmode, now set properly if needed
• some BG95 devices and BG77 do not support nwscanmode and were excluded

Steps to Test

• Force M404 and M524 to connect on 2G by changing int desiredNwScanMode = 1;
• Force M524 to connect on 3G by changing int desiredNwScanMode = 5; // or possibly 2
• Force M404 and M524 to connect on LTE by changing int desiredNwScanMode = 3;
• Standard modes will be tested with DVOS release tests.

References

• [sc-127103]