mtd: drop physmap_configure

physmap_configure() and physmap_set_partitions() have no users in kernel.
Out of kernel users should have been converted to regular platform device
long ago. Drop support for this obsolete API.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>