fix usb tethering

Change-Id: Ib40b29f572ba508c1d04d26ff6b2609da81b0701
gps: turn down logging

* This can be turned back on if needed without having to recompile
  anyway.

Change-Id: Ic4ad6c9a1156eff0b69b565bfdca95902746bf8a
d2-common: dex-opt to cache

Cache partition is ~850 MB. We have the space.

Change-Id: I70e0bda7553b6c2dab4aed97feda8b817a9ef3b9
d2-common: fix up modem links

Ensure /firmware is mounted before generating the links

Change-Id: I169d8a5673d5e6b6059c81e84bfe2ccf3b8bfc22
d2: use commonized defconfig

Change-Id: I6b3547c013cc0db584b1fe5de3e2cc183b93f535
Revert "remove qrngd"

This reverts commit 35072180e3604d029cc993c1af825f0e04ae24d3.

Change-Id: I589e6fdb0b4702c8b55ca0b47b3819db128f8e7f
d2-common: update perms

/dev/rtc0 to 0660
add perms for wcnss for the stepchildren

Change-Id: Ic73a473c2086ee531ace5a54f9fe0a85c1a8523c