ue,phy: update the PRACH params inside the lambda that also executes the reconfig

setting the new PRACH params (writing the the local var) needs to protected as well
because it is called from the RRC context and the PHY worker will call configure_prach_params()
if it sees changes to it.

srsue/src/phy/phy.cc

@@ -454,16 +454,16 @@ bool phy::set_config(const srsran::phy_cfg_t& config_, uint32_t cc_idx)
 
   Info("Setting configuration");
 
-  // The PRACH configuration shall be updated only if:
-  // - The new configuration belongs to the primary cell
-  // - The PRACH configuration is present
-  if (!cc_idx && config_.prach_cfg_present) {
-    prach_cfg = config_.prach_cfg;
-    prach_cfg.tdd_config = tdd_config;
-  }
-
   // Apply configurations asynchronously to avoid race conditions
   cmd_worker.add_cmd([this, config_, cc_idx]() {
+    // The PRACH configuration shall be updated only if:
+    // - The new configuration belongs to the primary cell
+    // - The PRACH configuration is present
+    if (!cc_idx && config_.prach_cfg_present) {
+      prach_cfg            = config_.prach_cfg;
+      prach_cfg.tdd_config = tdd_config;
+    }
+
     logger_phy.info("Setting new PHY configuration cc_idx=%d...", cc_idx);
     lte_workers.set_config(cc_idx, config_);