Fix for coverity issue of medium impact: Possible data race (#27918)

### Details:
 - *Fixed "Data race condition" (Medium) Coverity issue*
- *Mirrored part of
#27916

### Tickets:
 - *EISW-149544*

Author: AsyaPronina

src/plugins/intel_npu/src/plugin/npuw/weights_bank.cpp

@@ -132,10 +132,15 @@ ov::Tensor Bank::eval_and_alloc(const LazyTensor& tensor,
 
 bool Bank::is_remote(const LazyTensor& tensor) const {
     // FIXME: make generic
+    std::lock_guard<std::mutex> guard(m_mutex);
+
     auto npu_bank = m_device_banks.find("NPU");
-    if (npu_bank != m_device_banks.end() && npu_bank->second.storage.find(tensor) != npu_bank->second.storage.end()) {
-        // Found in NPU bank so considered remote (utterly wrong for the generic case)
-        return true;
+    if (npu_bank != m_device_banks.end()) {
+        std::lock_guard<std::mutex> dev_guard(npu_bank->second.mutex);
+        if (npu_bank->second.storage.find(tensor) != npu_bank->second.storage.end()) {
+            // Found in NPU bank so considered remote (utterly wrong for the generic case)
+            return true;
+        }
     }
     return false;
 }

src/plugins/intel_npu/src/plugin/npuw/weights_bank.hpp

@@ -38,13 +38,13 @@ class Bank {
     // Bank for specified device and their allocated memory
     struct DeviceBank {
         std::unordered_map<LazyTensor, ov::Tensor, LazyTensor::Hash> storage;
-        std::mutex mutex;
+        mutable std::mutex mutex;
     };
     std::unordered_map<std::string, DeviceBank> m_device_banks;
 
     ov::Tensor eval_and_alloc(const LazyTensor& tensor, DeviceBank& dbank, const std::string& device);
 
-    std::mutex m_mutex;
+    mutable std::mutex m_mutex;
     std::shared_ptr<const ov::ICore> m_core = nullptr;
     std::string m_alloc_device;
 };