ARM: dts: msm Increase secure mem heap size for msmtitanium

Memory requirement of secure mem has increased
as new use cases for WFD has been added on target.
So increase the size of secure mem to 140MB
from current 112MB.

CRs-Fixed: 974943
Change-Id: I739bd5ea3df8b2ad70288875a7bc110b078f1bb5
Signed-off-by: Susheel Khiani <skhiani@codeaurora.org>