ARM: dts: msm: earlycon commandline parameter in bootargs for lagoon

Change to pass early console commandline parameter in bootargs
for lagoon.
This change is required as lito and lagoon share same build
combo and uart instance for earlycon is different for both
targets.

Change-Id: I08d4d67f3abc7d7428b3c0beeda28005e61f3e43