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

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

Change-Id: Ia4531240ed132de30e4af333bc3c6b78143a501c
Fixes: 69842cba ("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
Git-commit: dcd6dffb0a75741471297724640733fa4e958d72
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git


Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>