Revert "Fix typo: configuation => configuration" partially

This is a partial revert of 0b1974de ("Fix typo: configuation
=> configuration") as this hunk is removed in net-next.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>