P51XX: add a working QWERTZ sec_keyboard layout

Our existing keylayout wasn't working correctly in the past, so let's
use a working QWERTZ layout for now.

Thanks to Pevtrick @ www.android-hilfe.de

Change-Id: I04114acf5c6cad4a36220756e04119d944bb70c2
P51XX: add an init.d script to load the keyboard dock driver

This script can be enabled if needed. Turn it off by default
because the software keyboard won't pop up if the driver got
loaded.

Change-Id: I5a6843370f19744ba61a482cf849c9bd67e766b0