FROMLIST: sched/debug: Add support for displaying task's core_cookie

Needed by tast test which checks if cookies are setup correctly for
tasks.

This patch only borrows the debug bits from the upstream patch below.
The rest of the upstream code is not backportable or needed at the
moment.
(am from https://lore.kernel.org/patchwork/patch/1322688/)

BUG=b:152605392
TEST=tast -verbose run -build=true $IP sched.CoreSchedTag

Change-Id: I5afd1a77c919ff777048007b02f1577b70da25d6
Signed-off-by: Joel Fernandes <joelaf@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2488781
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
1 file changed