ARM: dts: msm: sa6155p: sde changes for LA hypervisor

add support for sde kms in LA guest to enable display
for LA Guest on sa6155p.

Change-Id: I52696285d2ed26e7047af3c9b358dffd53a5ec18
Signed-off-by: Venkata Rao Kakani <vkakani@codeaurora.org>