tegra-profiler: record offset of the stack pointer

tegra-profiler: record offset of the stack pointer

Tegra Profiler: when collecting backtraces, record
remaining data stack size.

Bug 1584533

Change-Id: I608ab73f8e1b7da84221a17a782080fdf5598111
Signed-off-by: Igor Nabirushkin <inabirushkin@nvidia.com>
Reviewed-on: http://git-master/r/658431
GVS: Gerrit_Virtual_Submit
Reviewed-by: Andrey Trachenko <atrachenko@nvidia.com>
Tested-by: Maxim Morin <mmorin@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>