init: fold init.target.rc into init.iproj.rc to align with i_atnt.
init: fold ueventd.rc into ueventd.iproj.rc to align with i_atnt.
init: remove prebuilt init.usb.rc, it is the same as the standard one.
init: run init.qcom.mdm_links.sh in the property:ro.baseband trigger.

This allows the baseband to be set correctly because ro.product.device
is not available during the emmc-fs trigger.

It also aligns better with i_atnt, which is nice.