Revert "Revert "ANDROID: Revert "softirq: Let ksoftirqd do its job"""

This reverts commit c646ea5a, as the
merge conflicts have been resolved.

Bug: 168521633
Change-Id: Ide895e808fd0786b6690334d62d250f73584508e
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>
[satyap@codeaurora.org: Fix trivial merge conflicts]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
[elavila: Port to mainline]
Signed-off-by: J. Avila <elavila@google.com>
Signed-off-by: Shaleen Agrawal <shalagra@codeaurora.org>