mips64: Add BE version of cvm_lx_ins.stdout.exp

Read-memory tests are endian sensitive.
Add BE version of cvm_lx_ins.stdout.exp that has been tested on
Cavium Octeon II in BE mode.

Related to Bugzilla issue 326444.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13805 a5019735-40e9-0310-863c-91ae7b9d1cf9