Revert "power: qpnp-fg-gen4: Enable parallel charging current measurement"

This reverts commit 1b7e5a86.

Enabling parallel charging current measurement causes ADC to lock
up when this register write happens right in the middle of a
conversion cycle. Keep it disabled until the proper way to enable
it is found.

CRs-Fixed: 2305615
Change-Id: I08e6e887fb11bca2e582091308798fec3c29357d
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>