sched/fair: Call update_curr() before unthrottling the hierarchy

Subsequent commits will allow update_curr() to throttle the hierarchy
when the runtime accounting exceeds allocated quota. Call update_curr()
before the unthrottle event, and in tg_unthrottle_up() to catch up on
any remaining runtime and stabilize the "runtime_remaining" and
"throttle_count" for that cfs_rq.

Doing an update_curr() early ensures the cfs_rq is not throttled right
back up again when the unthrottle is in progress.

Since all callers of unthrottle_cfs_rq(), except two, already update the
rq_clock and call rq_clock_start_loop_update(), move the
update_rq_clock() from unthrottle_cfs_rq() to the callers that don't
update the rq_clock.

Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Benjamin Segall <bsegall@google.com>
Tested-by: Aaron Lu <ziqianlu@bytedance.com>
Link: https://patch.msgid.link/20260602052531.11450-1-kprateek.nayak@amd.com

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