Add in port0/port6 configuration as part of the platform data code path.

It's still hardcoded (for db120) but it is now hardcoded in all the
same place (ie, the pdata path.)  The port config/status code now checks
port0/port6 as appropriate to configure things.

Tested:

* Qualcomm Atheros DB120, AR8327 switch.
Update ATP driver:
- Add support for emulating a mouse wheel, Z-axis.

Submitted by:	Rohit Grover <rgrover1@gmail.com>
MFC after:	2 weeks
Enable the second and the third I2C controllers on Beaglebone-black.

The first I2C controller is only used to manage the on-board devices (PMIC
and HDMI framer) and its bus is not exposed on the expasion headers.

With this change the following pins on the P9 expansion headers are now
reserved as I2C pins:

 Pin 17 - I2C1 SCL
 Pin 18 - I2C1 SDA
 Pin 19 - I2C2 SCL
 Pin 20 - I2C2 SDA

The I2C2 is the bus that should be used to read the contents of cape
eeproms.

Approved by:	adrian (mentor, implicit)
Consistently pass around context information using a simple pointer.  This
fixes some dereferencing bugs in Chinese character set conversions.

PR:		185964
MFC after:	5 days
Merge remote-tracking branch 'upstream-github/master' into soldierx/lattera/aslr