ARM: dts: msm: Increase CMA region to 40 MB on sm6150

Recently coresight-tmc device support got added which needs 4 MB of CMA.
To accommodate this, increase cma region size to 40 MB from 32 MB.

Change-Id: Ic0cf8bae8c3d89b21679f87563b685593ef17f71
Signed-off-by: Tiger Yu <tfyu@codeaurora.org>