ARM: dts: msm: Disable mss PIL loading for LW targets

Since the modem doesn't exist on LW targets, there's no need to perform MSS
PIL loading.

Change-Id: I89a37467d3c88759b5b813c0289b70bf111cc916
Signed-off-by: Anurag Singh <anursing@codeaurora.org>
Signed-off-by: Tirtha Kanti Ghosh <tirtha@codeaurora.org>