PATA host controller driver for ep93xx

Add PATA host controller driver for ep93xx.

Signed-off-by: Rafal Prylowski <prylowski@metasoft.pl>
Cc: Joao Ramos <joao.ramos@inov.pt>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>