[OpenMP] Remove omptarget-nvptx from deps as it is no longer a valid target

`omptarget-nvptx` is still a dependence for `check-libomptarget-nvtpx`
although it has been removed by D94573.

Reviewed By: JonChesterfield

Differential Revision: https://reviews.llvm.org/D94725

Author: shiltian

openmp/libomptarget/deviceRTLs/nvptx/test/CMakeLists.txt

@@ -3,7 +3,7 @@ if(NOT OPENMP_TEST_COMPILER_ID STREQUAL "Clang")
   return()
 endif()
 
-set(deps omptarget-nvptx omptarget omp)
+set(deps omptarget omp)
 if(LIBOMPTARGET_NVPTX_ENABLE_BCLIB)
   set(deps ${deps} omptarget-nvptx-bc)
 endif()