kernel: split 82574L patch into multiple files

kernel: split 82574L patch into multiple files

When refreshing patches that cointain multiple patches including headers
in a single file, quilt will remove the headers from all but the first
patch. This makes it difficult to review commits that refresh patches.
Next to that, if only a few of the patch series are accepted in -stable,
the patch needs to be manually modified. With each patch in a separate
file, it's just a matter of git rm.

Refresh patches while at it.

Patchwork links:
[1/5] https://patchwork.kernel.org/patch/9857487/
[2/5] https://patchwork.kernel.org/patch/9857489/
[3/5] https://patchwork.kernel.org/patch/9857495/
[4/5] https://patchwork.kernel.org/patch/9857491/
[5/5] https://patchwork.kernel.org/patch/9857493/

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>