UPSTREAM: update to latest version of scripts/checkpatch.pl

A number of upstream patches are getting rejected by checkpatch in
treehugger despite following the correct checkpatch rules as they have
changed since the 5.4 release.

So update to the latest version, from 5.9-rc1, to quiet things that are
now valid.

Bug: 164355829
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
(cherry picked from commit a1d21081a60dfb7fddf4a38b66d9cef603b317a9)
Change-Id: Ic3768ec45972d43885fd3170f96ad03dd9d852fc