sched: move logging process id in the rtb to sched

commit 'c3c9f764 ("arm64: mm: Log the process id in the rtb")'
introduced logging process id into the rtb buffer, it works fine for
64-bit systems but need additional change in assembly code for 32-bit
systems.

So moving it into scheduler to avoid dependency with architecture.

Change-Id: I20dd7ac5e7a76d8abfcc5dd2344c22a4c5dd6ffb
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>