Add PPC64le support information

Summary: Add PPC64le support information on LLDB site

Reviewers: clayborg

Reviewed By: clayborg

Subscribers: labath, lldb-commits, lbianc, clayborg

Differential Revision: https://reviews.llvm.org/D47285
Patch by Alexandre Yukio Yamashita <alexandre.yamashita@eldorado.org.br>.

llvm-svn: 333173