ARM: dts: msm: Add PMI632 GPIO configuration for parallel-current sense

The parallel charger's current is sensed by the external-sense
over GPIO7/GPIO8 of PMI632. Add pinctrl configuration for these
GPIOs to disable them.

Change-Id: I348b69467103c6b953c518ae807e5d07ca3c877a
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>