Define aix's .cmp_info.itimer_ns value to a default. The multiplexing tests are happy on power7 aix now.
Define aix's .cmp_info.itimer_ns value to a default.
The multiplexing tests are happy on power7 aix now.

pyrovski/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi