perf intel-pt: Simplify intel_pt_get_vmcs()

Simplify and remove unnecessary constant expressions.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20231005190451.175568-3-adrian.hunter@intel.com


Signed-off-by: Namhyung Kim <namhyung@kernel.org>