Add support for device specific extensions.

Change-Id: I3ffd125875067b00bc225556c09fbe2d02f11022
Signed-off-by: Zdunowski, Piotr <piotr.zdunowski@intel.com>

runtime/device/device_caps.cpp

@@ -159,6 +159,8 @@ void Device::initializeCaps() {
     simultaneousInterops = {0};
     appendOSExtensions(deviceExtensions);
 
+    deviceExtensions += hwHelper.getExtensions();
+
     deviceInfo.deviceExtensions = deviceExtensions.c_str();
 
     exposedBuiltinKernels = builtInKernels;

runtime/helpers/hw_helper.h

@@ -14,6 +14,7 @@
 #include "CL/cl.h"
 
 #include <cstdint>
+#include <string>
 #include <type_traits>
 
 namespace OCLRT {
@@ -59,6 +60,7 @@ class HwHelper {
     virtual size_t getScratchSpaceOffsetFor64bit() = 0;
     virtual const std::vector<EngineType> getGpgpuEngineInstances() const = 0;
     virtual bool getEnableLocalMemory(const HardwareInfo &hwInfo) const = 0;
+    virtual std::string getExtensions() const = 0;
 
     static constexpr uint32_t lowPriorityGpgpuEngineIndex = 1;
 
@@ -146,6 +148,8 @@ class HwHelperHw : public HwHelper {
 
     bool getEnableLocalMemory(const HardwareInfo &hwInfo) const override;
 
+    std::string getExtensions() const override;
+
   protected:
     HwHelperHw() = default;
 };

runtime/helpers/hw_helper_common.inl

@@ -185,6 +185,11 @@ bool HwHelperHw<Family>::getEnableLocalMemory(const HardwareInfo &hwInfo) const
     return OSInterface::osEnableLocalMemory && isLocalMemoryEnabled(hwInfo);
 }
 
+template <typename Family>
+std::string HwHelperHw<Family>::getExtensions() const {
+    return "";
+}
+
 template <typename Family>
 typename Family::PIPE_CONTROL *PipeControlHelper<Family>::obtainPipeControlAndProgramPostSyncOperation(LinearStream *commandStream,
                                                                                                        POST_SYNC_OPERATION operation,