Piotr Ziecik <kosmo@semihalf.com> Due to errors in chipselect management in davinci_nand driver

OpenOCD was able to access only to chips attached to first EMIF
chipselect. This patch fixes chipselect management code and allows
OpenOCD to access to NAND devices attached to any EMIF CS line.

git-svn-id: svn://svn.berlios.de/openocd/trunk@2585 b42882b7-edfa-0310-969c-e2dbd0fdcd60