sched/core: Fix size of rq::uclamp initialization

sched/core: Fix size of rq::uclamp initialization

[ Upstream commit dcd6dffb0a75741471297724640733fa4e958d72 ]

rq::uclamp is an array of struct uclamp_rq, make sure we clear the
whole thing.

Fixes: 69842cba9ace ("sched/uclamp: Add CPU's clamp buckets refcountinga")
Signed-off-by: Li Guanglei <guanglei.li@unisoc.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Qais Yousef <qais.yousef@arm.com>
Link: https://lkml.kernel.org/r/1577259844-12677-1-git-send-email-guangleix.li@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>