overlay: overlay the overlay with moar overlays

We need to overlay our own verizon eri.xml's these break other devices (namely toro)
by causing a roaming icon. Without them, we get "Roaming Indicator Off" instead of
"Verizon Wireless". Which I'm fine with, but most end users stab me over it.

Need to switch to using PRODUCT_PACKAGES_OVERLAY instead of DEVICE_PACKAGES_OVERLAY
or it won't take precedence.

Change-Id: Ieba26464ae1872644de213544bd970a9cdd46efc
overlay: use DEVICE_PACKAGE_OVERLAYS

This is the old behavior. It was included in a commit
that overrode vendor/cm which we don't need to do anymore.

Change-Id: I64ebb5b9e60124359f875c291429839d7c8d7282
qcom-common: allow multiple hardware tunables includes

Change-Id: I95773d0442cc64027d52c037c86675c6c012b2e4