sched: debug: Fix build warning

Our import of commit 7595959 introduced a build warning.

Fixes:
kernel/sched/debug.c: In function 'print_cfs_rq':
kernel/sched/debug.c:218:2: warning: format '%ld' expects argument of type 'long int', but argument 4 has type 'u64' [-Wformat]
kernel/sched/debug.c:218:2: warning: format '%ld' expects argument of type 'long int', but argument 3 has type 'u64' [-Wformat]

Signed-off-by: Luis Cruz <ljc2491@gmail.com>