ptdump: diagnose unknown options
ptdump: diagnose unknown options

When an unknown option is used, ptdump prints a one-line usage help.  Diagnose
the error and print the unknown option, instead.

Change-Id: I1e3bd85d0bbdc602182644805a5dfe23cff14bf4
Signed-off-by: Markus Metzger <5f675b2b36595f90898e014b548ff7d9bbff2ab7@intel.com>

01org/processor-trace,01org/processor-trace,01org/processor-trace