Update elf library search path with lib64 path as well

The elf libraries are installed in /usr/lib64 in RHEL.
Removed invalid paths

Change-Id: I8c2b5525c1e3b62a2bd4e31a442d9931005c2f30
Signed-off-by: Chris Freehill <cfreehil@amd.com>

runtime/hsa-runtime/cmake_modules/FindLibElf.cmake

@@ -27,8 +27,6 @@ find_path (LIBELF_INCLUDE_DIRS
     /usr/local/include/libelf
     /opt/local/include
     /opt/local/include/libelf
-    /sw/include
-    /sw/include/libelf
     ENV CPATH)
 
 find_library (LIBELF_LIBRARIES
@@ -36,9 +34,11 @@ find_library (LIBELF_LIBRARIES
     elf
   PATHS
     /usr/lib
+    /usr/lib64
     /usr/local/lib
+    /usr/local/lib64
     /opt/local/lib
-    /sw/lib
+    /opt/local/lib64
     ENV LIBRARY_PATH
     ENV LD_LIBRARY_PATH)