pttc: use sizeof() to determine the length of a string literal
pttc: use sizeof() to determine the length of a string literal

Store keywords in constant string buffers so we don't fall over typos when
trying to use the same keyword in different places.

Store pt_marker and sb_marker in a constant string buffer.

Change-Id: I3aaa4eef5f13165d179e9ba6c106adf70b67b873
Signed-off-by: Markus Metzger <5f675b2b36595f90898e014b548ff7d9bbff2ab7@intel.com>

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