Enable tests hipTestDeviceSymbol,hipTestConstant and p2p_copy_coherency on hip-vdi

SWDEV-225266: [HIP-VDI] HIP-VDI disabled tests (p2p_copy_coherency.cpp)
SWDEV-225388: hipTestDeviceSymbol.cpp & hipTestConstant.cpp failed to build on hip-vdi

For hipTestDeviceSymbol.cpp & hipTestConstant.cpp tests:
Currently "__HIP_VDI__" flag is enabled in CMakeLists.txt, but when application is compiled with hipcc,  
__HIP_VDI__ is not defined to differentiate if compiled for VDI/HCC for headers.

For ./src/runtimeApi/memory/p2p_copy_coherency.cpp:
Fixed compilation issue to include only when compile for HCC runtime "<hc_am.hpp> not found"
Currently test is disabled to run on all platforms. When validated on multi-GPU machine,
memcpy between multiple GPUs via GPU synchronization is not working on hcc and vdi path.
Need to validate on nvidia machine to know if test is valid. Disabled GPU synchronization test for now.

For ./src/runtimeApi/module/hipModuleTexture2dDrv.cpp:
updated test to generate tex2d_kernel.code object in build directory. Currently ctest looks for it in build directory.

Change-Id: I629d395a919c2440d921422716944c7940ed6010

bin/hipcc

@@ -221,8 +221,8 @@ if ($HIP_PLATFORM eq "clang") {
 
     $HSA_PATH=$ENV{'HSA_PATH'} // "$ROCM_PATH/hsa";
     $HIPCXXFLAGS .= " -isystem $HSA_PATH/include";
-    if (! $HIP_RUNTIME eq "HCC" ) {
-      $HIPCXXFLAGS .= " -fhip-new-launch-api";
+    if (!($HIP_RUNTIME eq "HCC")) {
+      $HIPCXXFLAGS .= " -D__HIP_VDI__ -fhip-new-launch-api";
     }
 
 } elsif ($HIP_PLATFORM eq "hcc") {