staging: et131x: Modify block comments to fit with networking style

In preparation for moving et131x to drivers/net, fixup the block
comments to match the preferred networking style - no /* on separate
line, but */ are on a seperate line.
Signed-off-by: NMark Einon <mark.einon@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>