qa: exercise the /proc/cpuinfo parsing code

Added test 885 which exercises architecture-specific aspects
of the proc_cpuinfo.c code in the Linux kernel PMDA.  This
test currently fails to produce expected output, due to some
issues in the aarch64 code.  Fix will follow.

The ppc64 output I had was somehow truncated, so removing it
for now until I source a new copy.
pmdalinux: fix aarch64 case in the /proc/puinfo parsing code

Extend test 885 significantly with a number of additional
/proc/cpuinfo cases for a variety of architectures.