New script init.qcom.baseband.sh to set baseband string. by tdm

init.qcom.mdm_links.sh must be run early on i_vzw (in the emmc-fs trigger),
and ro.product.device is not available yet.  So we separate out the baseband
logic into its own script and run that in the property:ro.baseband trigger.

Conflicts:

	device.mk
	prebuilt/init.qcom.mdm_links.sh

Change-Id: I82c1b98d03248b30c1bae05da11db9c37cf09583