staging: r8188eu: remove comments in update_recvframe_attrib_88e

Remove a couple of comments in update_recvframe_attrib_88e that provide no
useful information.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220305144117.1380534-6-martin@kaiser.cx


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