[offload][amdgpu] Set ...SHARED_DESCRIPTOR_MAX_SIZE default to 96 (llvm#1011)

passed all but hipCatch2, openmplibomptarget change

Author: ronlieb

offload/plugins-nextgen/amdgpu/src/rtl.cpp

@@ -2944,7 +2944,7 @@ struct AMDGPUDeviceTy : public GenericDeviceTy, AMDGenericDeviceTy {
                                     1 * 1024 * 1024), // 1MB
         OMPX_DGPUMaps("OMPX_DGPU_MAPS", false),
         OMPX_SharedDescriptorMaxSize("LIBOMPTARGET_SHARED_DESCRIPTOR_MAX_SIZE",
-                                     48),
+                                     96),
         AMDGPUStreamManager(*this, Agent), AMDGPUEventManager(*this),
         AMDGPUSignalManager(*this), Agent(Agent), HostDevice(HostDevice) {}