remove mpiP from list of known items for aarch64 tech preview (#358)

docs/recipes/install/common/tech_preview.tex

@@ -30,8 +30,8 @@ \section{Tech Preview}
 underlying ARM platform.
 \item MPI: The hardware used for validating this Tech Preview release contained
 only ethernet. The available MPI stacks reflect this test environment.
-\item mpiP: appears to have trouble collecting certain information in certain
-scenarios causing it to fail integration tests
+%\item mpiP: appears to have trouble collecting certain information in certain
+%scenarios causing it to fail integration tests
 \item Hypre and SuperLU-dist: the libraries build, but when linking test
 applications unresolved symbols remain
 \item Nagios and Ganglia: don't work on SLES-12-SP1 due to missing PHP5