ARM: dts: msm: Add default pinctrl state for BENGAL HSUART

When device gets probed, kernel picks up default state and sets
pinctrl to that configuration. Since default state contains UART
functionality, GPIO pins remains high which consumes power.

To resolve power leakage issue, add additional active state to
configure UART functionality and keep default state for the GPIO
during probe.

Change-Id: Id7469d742ad6be404760212a52f6f8a618851daa