[GPU] init enable_large_allocations to silent valgrind (#33022)

### Details:
 - found when running valgrind on yolov3

### Tickets:

Author: michal-miotk

src/plugins/intel_gpu/include/intel_gpu/runtime/engine.hpp

@@ -177,7 +177,7 @@ class engine {
     /// Create engine for given @p device
     engine(const device::ptr device);
     const device::ptr _device;
-    bool enable_large_allocations;
+    bool enable_large_allocations = false;
 
     std::array<std::atomic<uint64_t>, static_cast<size_t>(allocation_type::max_value)> _memory_usage_data{};
     std::array<std::atomic<uint64_t>, static_cast<size_t>(allocation_type::max_value)> _peak_memory_usage_data{};