sched: Fix section mismatch error

With recent LLVM tool chain section mismatch error is
observed with sched_init_task_load_windows variable.

So fix the following warning by defining variable
consistent manner.
kernel/sched/walt.h:43:35: warning: section attribute
is specified on redeclared variable [-Wsection].

Change-Id: I64159ac7e30256475ea81843914484d1b3bc2ca7
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>