d2lte: make tree universal.

* do what hammerhead did.
* shove cdma and gsm into one universal tree
* add variant script and releasetools based on attn1's jfgsm script

Change-Id: I4f2063ad5296297a945976ca011823c2a0487129
variant fixes

* get rid of variant.sh
* utilize INIT_VENDOR_LIB for our variant props

Change-Id: I9eee2e1239a07dee2fc13481264646c16b1cef83