ata: remove palmld pata driver

The PXA palmld machine was removed, so the pata driver is no
longer used and can be removed. There is a chance that some of
this code might be useful for turning some of the other PXA
PCMCIA host drivers into PATA drivers, but it's clear that
it would not work unmodified, and it seems unlikely that
someone would do this work.

Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-ide@vger.kernel.org
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>