A counter group having a counter max of zero is invalid and
will ultimately result in a hang when we try to split counters
into multiple passes. This is one of various scenarios that
result in a hang during counter splitting; see

 GPUOpen-Tools#69

This fixes only that specific scenario. We now check that the
group max isn't zero, and if it is, we give up trying to split
a public counter's HW counters into multiple passes. We log
an error, too.

Again, this isn't a comprehensive fix for issue 69. There could
be other cases of bad data that result in a hang. Issue 69 should
be fixed with a pass cap limit to cover all cases. But this
commit still adds value in that it flags the specific invalid GPU
counter metadata in addition to avoiding the hang.

Change-Id: I56d7d2043ba92c1b6088f0fdd68f5ec844e7b823

Fixed constant name and log statement

Also added missing GPA_ENUM_STRING_VAL for new error code