fb: Remove unused FBIOVERTICAL ioctl

Commit 6d1699583d7e added the FBIOVERTICAL ioctl and said that implementation
in driver will come later.
Since it was in 2001 I think we can remove this.

MFC after: 2 weeks
Sponsored by: Beckhoff Automation GmbH & Co. KG

(cherry picked from commit 87fae70dc58a16dfcdad75f929485c79d557bdd5)