made LCD panel initialization more universal
so that we can now use a single configuration file for all
GTA04-custom variants. The trick is to evaluate the mux=
command line argument and update the kernel data structures
dynamically so that finally we load a different panel
driver and have different platform data for the touch
screen.
The same mechanism can be used in the future to enable
custom board specific features like RFID reader etc.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>