ARM: dts: msm: update i2c slave address for fsa4480 on Lahaina

Update the i2c slave address from 0x43 to 0x42, which is the
correct value on Lahaina. This change enables programming the
fsa4480 over i2c, which is needed for use cases such as
DisplayPort.

Change-Id: I530f1fcd4e8307316305af6bbf5a951315acb11a