Fix OSS target name GPUtoNVVMTransforms -> MLIRGPUtoNVVMTransforms

This unbreaks the `cmake -G Ninja ../llvm -DLLVM_BUILD_EXAMPLES=ON -DLLVM_TARGETS_TO_BUILD="host"`
 in my local OSS build

PiperOrigin-RevId: 275452330
Change-Id: I1d1dc61e6b968f3d5cd1b218795eb193bd4ef7a7

third_party/mlir/lib/Conversion/GPUToNVVM/CMakeLists.txt

@@ -6,7 +6,7 @@ add_llvm_library(MLIRGPUtoNVVMTransforms
   LowerGpuOpsToNVVMOps.cpp
   )
 
-add_dependencies(GPUToNVVMTransforms
+add_dependencies(MLIRGPUtoNVVMTransforms
   MLIRGPUToNVVMIncGen)
 
 target_link_libraries(MLIRGPUtoNVVMTransforms