[ARM] pxa: removing dead IDE_PXA_CF

IDE_PXA_CF doesn't exist in Kconfig, therefore removing all references
for it from the source code.

Signed-off-by: Christoph Egger <siccegge@cs.fau.de>
Acked-by: Juergen Schindele <schindele@nentec.de>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>