mb/google/soraka: Camera PMIC run time power control

Currently PMIC (tps68470) is in active state even when cameras are not
in use. PMIC is put into SLEEP mode only when entering S3 via
smihandler.

With this change PMIC will be put into SLEEP mode as soon as sensors &
VCM voltage outputs are turned off. This will allow run time power
saving when camera is not in use.

PMIC will be reset in first boot & across S3 & S0ix cycles.

Also, remove the smi handler for PMIC power management & handle it as
part of sensor and VCM ACPI PowerResource.

BUG=b:63903239
TEST= Build for Soraka. Check Camera probe, Capture image across
S3 & S0ix cycles.
Also checked the following & found no regression:
1. Typical camera use cases
2. Stability tests related to camera
3. Reliability tests related to camera
4. PnP tests related to camera
5. Latency related tests with camera

Change-Id: I23b0c0a887c9eb5d29b89f14aebba273b01228e0
Signed-off-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Signed-off-by: Naresh G Solanki <naresh.solanki@intel.com>
Reviewed-on: https://review.coreboot.org/20741
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Rajmohan Mani <rajmohan.mani@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
4 files changed