staging: r8188eu: reorder assignments, clarify the header format

Reorder some of the assignments in update_recvframe_attrib_88e.

This should make it a bit easier to understand the format of the header
that is added by the chip's firmware.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20221106124901.720785-4-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>