[U-Boot-Users] Patch generalizing IDE Reset function for MPC5200

The following patch generalises the use of PSC1.4 for IDE Reset. The idea behind is that most probably many 5200 designs will be similiar to IceCube, _if_ they use the IDE interface. Using the otherwise quite useless PSC1.4 for UDE-Reset seems an obvious choice then.

Instead of continuosly adding more and more boards into the #if defined () chain, one define CONFIG_IDE_RESET_USE_PSC1_4 can be added to the board's configuration file.

If someone else uses another I/O port, that can be easyly added in a similiar way.

This patch patches cpu/mpc5xxx/ide.c AND include/config/IceCube.h.

Thanks, Pierre, for the good work, the driver works fine on our board.