[firmware] sim_switch + wwan_perst: Don't re-initialize

The logic to detect if the respective module is already initialized
or not was broken.  When performing initialization, we of course need
to set initialized=1.

firmware/libboard/common/source/sim_switch.c

@@ -69,5 +69,6 @@ int sim_switch_init(void)
 	PIO_Configure(&pin_conn_usim2, 1);
 	num_switch++;
 #endif
+	initialized = 1;
 	return num_switch;
 }