Fix hipExtLaunchMultiKernelMultiDevice compilation issue

Fix compilation error on hip-hcc+clang , hip-vdi+clang
Enabled hipExtLaunchMultiKernelMultiDevice test on hip-vdi path
hipExtLaunchMultiKernelMultiDevice common declaration for all paths

Change-Id: I76031840614fce8e12a8e845548fa43a389a741a

include/hip/hcc_detail/functional_grid_launch.hpp

@@ -189,16 +189,6 @@ void hipLaunchKernelGGL(F kernel, const dim3& numBlocks, const dim3& dimBlocks,
                                      stream, &config[0]);
 }
 
-inline
-__attribute__((visibility("hidden")))
-hipError_t hipExtLaunchMultiKernelMultiDevice(hipLaunchParams* launchParamsList,
-                                              int  numDevices, unsigned int  flags) {
-    hip_impl::hip_init();
-    auto& ps = hip_impl::get_program_state();
-    return ihipExtLaunchMultiKernelMultiDevice(launchParamsList, numDevices, flags, ps);
-
-}
-
 template <typename F>
 inline
 __attribute__((visibility("hidden")))

include/hip/hcc_detail/hip_runtime_api.h

@@ -2962,7 +2962,6 @@ hipError_t hipOccupancyMaxActiveBlocksPerMultiprocessor(
 hipError_t hipOccupancyMaxActiveBlocksPerMultiprocessorWithFlags(
    uint32_t* numBlocks, hipFunction_t f, uint32_t blockSize, size_t dynSharedMemPerBlk, unsigned int flags);
 
-#if __HIP_VDI__ && !defined(__HCC__)
 /**
  * @brief Launches kernels on multiple devices and guarantees all specified kernels are dispatched
  * on respective streams before enqueuing any other work on the specified streams from any other threads
@@ -2977,7 +2976,6 @@ hipError_t hipOccupancyMaxActiveBlocksPerMultiprocessorWithFlags(
 hipError_t hipExtLaunchMultiKernelMultiDevice(hipLaunchParams* launchParamsList,
                                               int  numDevices, unsigned int  flags);
 
-#endif
 
 // doxygen end Version Management
 /**