Config: arm: disable sched_debug for sdxlemur

CONFIG_SCHED_DEBUG maintains scheduler statistic debug information
and can accessed the data dynamically.
On user builds, its not needed to enable debug related information,
so disable the scheduler debug.
It can improve system performance and network throughput too.

Change-Id: Ic0ca28d49210266fc5931979cde7f72a5c421e79
CRs-Fixed: 3048893
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>
Signed-off-by: Jianmin Zhu <jianminz@codeaurora.org>