defconfig: Disable CONFIG_SYSRQ_SCHED_DEBUG for MSM targets

CONFIG_SYSRQ_SCHED_DEBUG results in verbose printk output when the
"show-task-states(T)" or "show-blocked-tasks(W)" sysrq triggers
are invoked. Because this can increase the chances of a watchdog
bark when the system is under heavy load, disable these debug
prints by default.

Change-Id: Ifb58b70c1816daa41fe5a0d7f1fe4d36ddacaeb4
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>