topology: pre-process-base: add support for VendorToken objects

topology: pre-process-base: add support for VendorToken objects

Add support for pre-processing VendorToken objects.
For ex:
Object.Base.VendorToken."sof_tkn_dai" {
	dmac_config		153
	dai_type		154
	index			155
	direction		156
}

would be converted to:

SectionVendorTokens."sof_tkn_dai" {
	dmac_config 153
	dai_type 154
	index 155
	direction 156
}

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