ethtool: Revert incorrect indentation changes

commit 97f8aefb "net: fix ethtool
coding style errors and warnings" changed the indentation of several
macro definitions in ethtool.h.  These definitions line up in the diff
where there is an extra character at the start of each line, but not
in the resulting file.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>