Start rdc.service after installing the rdc package

The starting of rdc.service was done in preinstall scripts. It should be started after installing rdc package.
Moved the functionality to postinstall scripts

Change-Id: I9a8c733beea43f95474b990a35a431db287b9a8e


[ROCm/rdc commit: b09eede016]

projects/rdc/CMakeLists.txt

@@ -498,7 +498,7 @@ list(APPEND CPACK_RPM_EXCLUDE_FROM_AUTO_FILELIST_ADDITION "/lib"
 # Only add extras to RUNTIME package (not tests)
 # It makes no sense to modify RDCD service when installing tests
 # https://cmake.org/cmake/help/latest/cpack_gen/rpm.html#variable:CPACK_RPM_PRE_INSTALL_SCRIPT_FILE
-set(CPACK_RPM_RUNTIME_PRE_INSTALL_SCRIPT_FILE
+set(CPACK_RPM_RUNTIME_POST_INSTALL_SCRIPT_FILE
     "${CMAKE_CURRENT_SOURCE_DIR}/RPM/rpm_post")
 set(CPACK_RPM_RUNTIME_PRE_UNINSTALL_SCRIPT_FILE
     "${CMAKE_CURRENT_SOURCE_DIR}/RPM/rpm_preun")