consistently use 0-based counting of modems/slots

firmware/libboard/common/source/sim_switch.c

@@ -27,12 +27,12 @@ int sim_switch_use_physical(unsigned int nr, int physical)
 
 	switch (nr) {
 #ifdef PIN_SIM_SWITCH1
-	case 1:
+	case 0:
 		pin = &pin_conn_usim1;
 		break;
 #endif
 #ifdef PIN_SIM_SWITCH2
-	case 2:
+	case 1:
 		pin = &pin_conn_usim2;
 		break;
 #endif

firmware/libboard/qmod/source/board_qmod.c

@@ -184,17 +184,17 @@ void board_exec_dbg_cmd(int ch)
 		break;
 	case '1':
 		printf("Resetting Modem 1 (of this SAM3)\n\r");
-		wwan_perst_do_reset_pulse(1, 300);
+		wwan_perst_do_reset_pulse(0, 300);
 		break;
 	case '2':
 		printf("Resetting Modem 2 (of this SAM3)\n\r");
-		wwan_perst_do_reset_pulse(2, 300);
+		wwan_perst_do_reset_pulse(1, 300);
 		break;
 	case '!':
-		sim_switch_use_physical(1, 0);
+		sim_switch_use_physical(0, 0);
 		break;
 	case '@':
-		sim_switch_use_physical(2, 0);
+		sim_switch_use_physical(0, 0);
 		break;
 	default:
 		if (!qmod_sam3_is_12())

firmware/libboard/qmod/source/wwan_perst.c

@@ -45,11 +45,11 @@ static struct wwan_perst *get_perst_for_modem(int modem_nr)
 
 	switch (modem_nr) {
 #ifdef PIN_PERST1
-	case 1:
+	case 0:
 		return &perst1;
 #endif
 #ifdef PIN_PERST2
-	case 2:
+	case 1:
 		return &perst2;
 #endif
 	default: