UPSTREAM: kheaders: Have cpio unconditionally replace files

For out-of-tree builds, this script invokes cpio twice to copy header
files from the srctree and subsequently from the objtree. According to a
comment in the script, there might be situations in which certain files
already exist in the destination directory when header files are copied
from the objtree:

"The second CPIO can complain if files already exist which can happen
with out of tree builds having stale headers in srctree. Just silence
CPIO for now."

GNU cpio might simply print a warning like "newer or same age version
exists", but toybox cpio exits with a non-zero exit code unless the
command line option "-u" is specified.

To improve compatibility with toybox cpio, add the command line option
"-u" to unconditionally replace existing files in the destination
directory.

Bug: 312397409
Bug: 312700424
Signed-off-by: Daniel Mentz <danielmentz@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Change-Id: I1797f7ca3f36c71a313cccce1bc53fcc2d04ca65
Signed-off-by: Srinivasarao Pathipati <quic_c_spathi@quicinc.com>
(cherry picked from commit 1e8ca62b)