ARM: dts: msm: increase modem size as per new memory map

Increase modem size from 139MB to 147MB on 512MB variant
as per new memory map for CV2X support. This is applicable
only for auto targets and hence changing only in TTP DT.

Change-Id: I3ef9d4b0ba7c2c4e6e6ff719007e926a3804ab5c
Signed-off-by: Abinaya P <abinayap@codeaurora.org>