ARM: dts: msm: Add qseecom heap for atoll

The qseecom_ta heap will be used by qseecom
userspace library for allocating memory for
loading trusted applications.

Change-Id: I7ab46adf6c7f46e1839c6bb310a92bbb62057365
Signed-off-by: Anmolpreet Kaur <anmolpre@codeaurora.org>