Revert "ethtool: Fix link extended state for big endian"

This reverts commit 462c5e6c as it
breaks the KABI.  It will be reverted the next KABI gate in a week.

Fixes: efe3167e ("Linux 5.15.27")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I269cd4144a2da69aa43de9055f797d0c0ba19bee