ARM: pia335x: fix signal name for GPIO1_28

- GPMC_BE1N -> GPMC_BEN1

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
ARM: pia335x: add LCDC display initialization for MMI board

- move touch init to MMI specific code

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
ARM: pia335x: remove old OMAPDSS based display code

- code was unused and just for reference

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>