Add API for notification of SetConfig(OMX_IndexConfig..) events to processor implementations

[juanrubio]

Currently, when SetConfig is called on a component, the processor servant is not notified and hence, no action will be taken.

The processor base class ( tizproc.h / tizproz_decls.h / tizproc.c ) needs to be updated so that a new callback method exists for reception of SetConfig events. The kernel servant needs to be modified in order to do the forwarding of the SetConfig event to the processor.