topology: pre-process-object: construct object name from its constructor attributes

topology: pre-process-object: construct object name from its constructor attributes

An object's name is derived from its constructor attribute
values separated by '.'. For example, the name for the
host widget objects is derived from its index and direction
attribute values as follows:
Object.Widget.host."playback" {
	index 2
}

The name for the host widget object would be host.2.playback.

Alternatively, if the object has a name attribute, the class
definition may skip the constructor attributes and the name attribute
value will be used instead.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>