drivers: modem: hl7800: Add runtime control of log level

Default mode must be debug or it can't ever be enabled.
Allow debug log messages to be printed when using
mdm_hl7800_send_at_cmd API.
Add logging to active bands and network coverage commands.

Signed-off-by: Ryan Erickson <ryan.erickson@lairdconnect.com>
2 files changed