[POWERPC] Remove interrupt-controller as a property under /chosen

  This node is a bit "special". Normally, that's where open firmware

  puts some variable environment information, like the arguments, or

  phandle pointers to nodes like the main interrupt controller, or the

  default input/output devices.

  the default input/output devices.

  This specification makes a few of these mandatory, but also defines

  some linux-specific properties that would be normally constructed by

      that the kernel tries to find out the default console and has

      knowledge of various types like 8250 serial ports. You may want

      to extend this function to add your own.

    - interrupt-controller : This is one cell containing a phandle

      value that matches the "linux,phandle" property of your main

      interrupt controller node. May be used for interrupt routing.

  Note that u-boot creates and fills in the chosen node for platforms

  that use it.

  (Note: a practice that is now obsolete was to include a property

  under /chosen called interrupt-controller which had a phandle value

  that pointed to the main interrupt controller)

  f) the /soc<SOCname> node

  This node is used to represent a system-on-a-chip (SOC) and must be