[ELF][PPC64] Use the regular placement for .branch_lt

The currently rule places .branch_lt after .data, which does not make
sense. The original contributor probably wanted to place .branch_lt
before .got/.toc, but failed to notice that .got/.toc are RELRO and
placed earlier.

Remove the special case so that .branch_lt is actually closer to .toc,
alleviating the distance issue.