ARM: dts: msm: Removing len parameters for mdss device tree

The len parameters for sizes of SSPP, DSPP, CTL and Mixer
interfaces are not used in the code anymore.

Removing those parameters from device tree.

Change-Id: Ib49a3d79c27f3291d942e0f36fcb78da93eb43f2
Signed-off-by: Krishna Chaitanya Parimi <cparimi@codeaurora.org>