Revert "Revert "ANDROID: sched: avoid migrating when softint on tgt cpu should be short""

This reverts commit 4196c1da, as the
merge conflicts have been resolved.

Bug: 31752786
Bug: 168521633
Change-Id: I6cb3fc698d567e03c67e2c4373ce75cc71cdfe9c
Signed-off-by: John Dias <joaodias@google.com>
[elavila: Amend commit text for AOSP, port to mainline]
Signed-off-by: J. Avila <elavila@google.com>
[ashayj@codeaurora.org: update usage of __IRQ_STAT and minor conflicts]
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>
Signed-off-by: Shaleen Agrawal <shalagra@codeaurora.org>