[fix][SWDEV-413305][nvcc] Recovering the fallback building of HIP programs via nvcc - Step 2 - Minor refactoring

[IMP]
+ The unused variable `$hasCU` is left untouched in its place - probably there are someone's unfinished continuous changes to merge there
+ The same testing is done manually: the `nvcc` command line left almost the same, only the `-x cu` changed its place

Author: emankov

amd/hipcc/bin/hipcc.pl

@@ -450,8 +450,9 @@ sub get_normalized_path {
                 if ($HIP_PLATFORM eq "amd") {
                     $hasHIP = 1;
                     $toolArgs .= " -x hip";
-                } else {
+                } elsif ($HIP_PLATFORM eq "nvidia") {
                     $hasCU = 1;
+                    $toolArgs .= " -x cu";
                 }
             }
         }
@@ -532,10 +533,6 @@ sub get_normalized_path {
     $ENV{HCC_EXTRA_LIBRARIES}="\n";
 }
 
-if ($HIP_PLATFORM eq 'nvidia') {
-    $HIPCXXFLAGS .= " -x cu";
-}
-
 if ($buildDeps and $HIP_PLATFORM eq 'nvidia') {
     $HIPCXXFLAGS .= " -M -D__CUDACC__";
     $HIPCFLAGS .= " -M -D__CUDACC__";