[PATCHv2 0/2] Robustness fixes for mbm

Hi all, Here are some robustness fixes for MBM modem. In 1/2 I've corrected my older patches which tried to detect the presence of the SIM card on the particular error response returned to AT+CPIN?. It did not work as expected. The patch 2/2 addresses problems initializing the modem too early. The initial command tends to fail when a MBM modem is inserted via USB and oFono tries to access the modem while it is still powering up and initializing itself. --Pekka