cmake: fix templating of SM architecture (#4434)

Signed-off-by: Connor Baker <[email protected]>

Author: ConnorBaker

CMakeLists.txt

@@ -177,7 +177,7 @@ if (DEFINED GPU_ARCHS)
   message(STATUS "GPU_ARCHS defined as ${GPU_ARCHS}. Generating CUDA code for SM ${GPU_ARCHS}")
   separate_arguments(GPU_ARCHS)
   foreach(SM IN LISTS GPU_ARCHS)
-    list(APPEND CMAKE_CUDA_ARCHITECTURES SM)
+    list(APPEND CMAKE_CUDA_ARCHITECTURES "${SM}")
   endforeach()
 else()
   list(APPEND CMAKE_CUDA_ARCHITECTURES 72 75 80 86 87 89 90)