Split *_product makefiles

So far, we have *_system.mk and *_vendor.mk.
This patch split all product settings from *_vendor.mk to new
*_product.mk

This patch also create a new telephony.mk to include all
telephony_*.mk

Bug: 119747870
Test: lunch mainline_arm64-user; make -j
Test: compare the content with and without the patch
Test: the output files in out folder are the same
Change-Id: I79aefdd1971b3b5724a3ec858de4109b645c765a