Cellular change for SARA-U201 only: increase PWR_ON pull time. (#1153)

The PWR_ON pull time for SARA-U201 is, from the data sheet, just 50 us, hence ubxlib used 1 ms.  However, the integration manual says to use 4 ms; given cable lengths/capacitances etc., the value used by ubxlib is now set to 10 ms.

cell/src/u_cell_private.c

@@ -99,7 +99,7 @@ uPortMutexHandle_t gUCellPrivateMutex = NULL;
  */
 const uCellPrivateModule_t gUCellPrivateModuleList[] = {
     {
-        U_CELL_MODULE_TYPE_SARA_U201, 1 /* Pwr On pull ms */, 1500 /* Pwr off pull ms */,
+        U_CELL_MODULE_TYPE_SARA_U201, 10 /* Pwr On pull ms */, 1500 /* Pwr off pull ms */,
         5 /* Boot wait */, 5 /* Min awake */, 5 /* Pwr down wait */, 5 /* Reboot wait */, 10 /* AT timeout */,
         50 /* Cmd wait ms */, 2000 /* Resp max wait ms */, 0 /* radioOffCfun */, 75 /* resetHoldMilliseconds */,
         2 /* Simultaneous RATs */,