replace .data references in rela entries with object symbols

For static objects, the compiler uses the section symbol (.data.*)
rather than the object symbol.  This causes an issue with linking
to the existing object in the kernel.

This commit goes through the rela sections selected for output
and replaces the data section symbols with the object symbols.
This allows proper linking to the data object in the kernel.

Signed-off-by: Seth Jennings <sjenning@redhat.com>