Merge pull request opencv#18424 from tomoaki0705:addRTX3080s

Author: alalek

cmake/OpenCVDetectCUDA.cmake

@@ -90,7 +90,7 @@ if(CUDA_FOUND)
   set(_arch_pascal  "6.0;6.1")
   set(_arch_volta   "7.0")
   set(_arch_turing  "7.5")
-  set(_arch_ampere  "8.0")
+  set(_arch_ampere  "8.0;8.6")
   if(NOT CMAKE_CROSSCOMPILING)
     list(APPEND _generations "Auto")
   endif()