Use USB for pls62. Fix find_expansion.sh

recipes-core/scripts-vesta/files/find_expansion_card.sh

@@ -38,13 +38,13 @@ do_start() {
         if [ $BOARD = "310-00110" ]; then
             echo "found verizon cell modem expansion card"
             /etc/init.d/ec21_cell_init.sh
-            /etc/init.d/ec21_pwron.sh usb
+            /etc/init.d/ec21_cell_pwron.sh usb
         fi
 
         if [ $BOARD = "310-00121" ]; then
             echo "found pls62-w cell modem expansion card"
             /etc/init.d/pls62_cell_init.sh
-            /etc/init.d/pls62_pwron.sh uart
+            /etc/init.d/pls62_cell_pwron.sh usb
         fi
 
         #add tests for additional expansion cards here as they become available