Fix ctests with HIP (#3982)

As reported in Issue #3981, some ctests are currently broken with HIP. 

The proposed changes:
- [x] fix a bug or incorrect behavior in AMReX
- [ ] add new capabilities to AMReX
- [ ] changes answers in the test suite to more than roundoff level
- [ ] are likely to significantly affect the results of downstream AMReX
users
- [ ] include documentation in the code and/or rst files, if appropriate

---------

Co-authored-by: Weiqun Zhang <WeiqunZhang@lbl.gov>

Tests/CMakeLists.txt

@@ -143,7 +143,7 @@ else()
       list(APPEND AMREX_TESTS_SUBDIRS FortranInterface)
    endif ()
 
-   if (AMReX_CUDA)
+   if (NOT AMReX_GPU_BACKEND STREQUAL NONE)
       list(APPEND AMREX_TESTS_SUBDIRS GPU)
    endif ()
 

Tests/LinearSolvers/NodeTensorLap/CMakeLists.txt

@@ -1,4 +1,4 @@
-if (NOT AMReX_CUDA)
+if (AMReX_GPU_BACKEND STREQUAL NONE)
     foreach(D IN LISTS AMReX_SPACEDIM)
         if(D EQUAL 1)
             continue()

Tests/Particles/ParallelContext/CMakeLists.txt

@@ -1,6 +1,6 @@
 foreach(D IN LISTS AMReX_SPACEDIM)
     set(_sources     main.cpp)
-    if (AMReX_CUDA)
+    if (NOT AMReX_GPU_BACKEND STREQUAL NONE)
       set(_input_files inputs.rt.cuda  )
     else ()
       set(_input_files inputs.rt  )

Tests/Particles/Redistribute/CMakeLists.txt

@@ -1,6 +1,6 @@
 foreach(D IN LISTS AMReX_SPACEDIM)
     set(_sources     main.cpp)
-    if (AMReX_CUDA)
+    if (NOT AMReX_GPU_BACKEND STREQUAL NONE)
       set(_input_files inputs.rt.cuda  )
     else ()
       set(_input_files inputs.rt  )

Tests/Particles/RedistributeSOA/CMakeLists.txt

@@ -1,6 +1,6 @@
 foreach(D IN LISTS AMReX_SPACEDIM)
     set(_sources     main.cpp)
-    if (AMReX_CUDA)
+    if (NOT AMReX_GPU_BACKEND STREQUAL NONE)
       set(_input_files inputs.rt.cuda  )
     else ()
       set(_input_files inputs.rt  )