1. Programs PNP values for AUNIT, BUNIT & TUNIT registers
as per reference code.
2. A new configuration option pnp_settings is introduced in
devicetree.cb to select PNP settings among performance,
power, power & performance.
TEST = built and booted glkrvp, verfied that the callback gets
control, verified warm and cold reboots.
Change-Id: Ibd70a42c9406941c8a93cc972f22c2475e9d0200
Signed-off-by: Divya Chellap <divya.chellappa@intel.com>
Reviewed-on: https://review.coreboot.org/22488
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
