Quectel EG25-G Delta Radio Firmware Upgrade support - libmts-io implementation

During testing with L4G1 device I discovered some inconsistencies in behaviour between
EG25-G device and EG95 devices (EG95-NA and EG95-E).

EG25-G device that I have on hands does not allow to perform downgrades using delta images.
When there is an attempt to apply a downgrade delta image it behaves as the following:

- radio prints `OK`
- radio prints `+QIND: "FOTA",502`
- radio is not rebooted

While EG95 radios always reboot at least once to apply the firmware image. Even if it is not valid.

Also I noticed that detach from the serial bus may take more than 10 seconds in some rare cases.
Thus we need to wait not a fixed amount of time but until the radio actually detaches from the bus.

This commit attempts to address the findings described above.

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