api,sim: new 'Active' property

In preparation for the multi-SIM setup, we need a way to tell whether
a given SIM card is active or not in the system.

On systems with one single SIM slot, the available SIM card will
always be active.

On Multi-SIM Single-Standby setups we may have multiple SIM slots with
multiple SIM cards, but only one of them will be active at any given
time.

On Multi-SIM Multi-Standby setups we may have multiple SIM slots with
multiple SIM cards that may be active at the same time. E.g. the QMI
protocol allows up to 5 different active SIM cards (primary,
secondary, tertiary...).

src/mm-base-sim.c

@@ -1715,6 +1715,7 @@ mm_base_sim_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 

src/mm-sim-mbim.c

@@ -752,6 +752,7 @@ mm_sim_mbim_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 

src/mm-sim-qmi.c

@@ -1315,6 +1315,7 @@ mm_sim_qmi_new (MMBaseModem         *modem,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
                                 MM_SIM_QMI_DMS_UIM_DEPRECATED, dms_uim_deprecated,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }