SWDEV-437189 - Provide option to enable/disable CPACK_SET_DESTDIR

The variable is already set as cache, so that user can override.
But the hard coded setting is preventing override. Removed the same

Change-Id: I2aecc18ce4f1d1b523ba267ef1c8ef4ea1168d9c

hipamd/packaging/CMakeLists.txt

@@ -146,12 +146,9 @@ if(DOXYGEN_EXE)
 endif()
 #End doc files install
 
-
 ##################################
 # Packaging steps COMMON Variables
 ##################################
-set(CPACK_SET_DESTDIR TRUE)
-
 set(CPACK_PACKAGE_VENDOR "Advanced Micro Devices, Inc.")
 set(CPACK_PACKAGE_CONTACT "HIP Support <hip.support@amd.com>")
 set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "HIP:Heterogenous-computing Interface for Portability")