Revert "servo_v4: Enable VBUS voltage and current measurement"

This reverts commit 2fa7472da15a402ba8649344016ab5351cb768e7.

Reason for revert: Use servo I2C driver to access the INA's instead. Don't need the INA driver and the console command in servo v4 firmware.

Original change's description:
> servo_v4: Enable VBUS voltage and current measurement
> 
> Enable the INA functions on the VBUS of the DUT port (PP_DUT) and the
> VBUS of the CHG port (PP_CHG).
> 
> BUG=b:132807223
> BRANCH=servo
> TEST=Typed the console command "ina 0" and returned:
> > ina 0
> Configuration: 4127
> Shunt voltage: 10d9 => 10782 uV
> Bus voltage  : 3d3a => 19592 mV
> Power        : 069b => 42275 mW
> Current      : 086d => 2157 mA
> Calibration  : 0400
> Mask/Enable  : 0008
> Alert limit  : 0000
> 
> Used a multimeter to measure the VBUS on the DUT port. The measured
> voltage and current are close to the above values.
> 
> Did the same thing on the CHG port.
> 
> Change-Id: I1d49540b4685f299437821251cd6422b1c0ac0b8
> Signed-off-by: Wai-Hong Tam <waihong@google.com>
> Reviewed-on: https://chromium-review.googlesource.com/1613805
> Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
> Reviewed-by: Scott Collyer <scollyer@chromium.org>

Bug: b:132807223
Change-Id: If8517ceb5255e38bb2824e6cb9fe1848142950c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1638718
Reviewed-by: Wai-Hong Tam <waihong@google.com>
Tested-by: Wai-Hong Tam <waihong@google.com>
Commit-Queue: Wai-Hong Tam <waihong@google.com>

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