[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]

[XuGuohui]

I tested it with a M524 and a M504:

[PASS] - Breathing cyan!

M524:

• [PASS] desiredNwScanMode = 1, 2G
• [PASS] desiredNwScanMode = 2, 3G
• [PASS] desiredNwScanMode = 3, LTE

M504:

• [PASS] desiredNwScanMode = 1, 2G
• [PASS] desiredNwScanMode = isQuec2g3gEnabled(), AUTO
• [N/A] 3G is not supported by the module
• [N/A] LET Cat-M1 is not available

[XuGuohui]

Tested on B504：

• 2G, not supported

> AT+QCFG="nwscanmode",1,1
< +CME ERROR: 3

• 3G, not connect

> AT+CEER
< +CEER: 0,-1
< OK
> AT+CEREG?
< +CEREG: 2,2
< OK
> AT+CGREG?
< +CGREG: 2,2
< OK
> AT+CREG?
< +CREG: 2,2
< OK
> AT+QCSQ
< +QCSQ: "NOSERVICE"
< OK

• LTE, connected