ARM: dts: msm: Fix FM chip ON issue

On Lahaina, 2.8v VDD supply is needed alongwith 1.8v VIO supply
to boot FM richwave chip.
As per schematics, L7E provides 2.8v supply from MSM PMIC, vote for
L7E to resolve the issue.

Change-Id: I87185b5124138134e0f5e0b25802048a54398765