misc: tegra-profiler: fix broken backtraces

misc: tegra-profiler: fix broken backtraces

Unwinding based on arm32 ehabi: fix broken backtraces when
all unwind entries are located in exidx section and
extab section is not exist.

Bug 1625585

Change-Id: I800e1347b04aa2c2c8802b81478931985c19feb2
Signed-off-by: Igor Nabirushkin <inabirushkin@nvidia.com>
Reviewed-on: http://git-master/r/720598
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Tested-by: Maxim Morin <mmorin@nvidia.com>
Reviewed-by: Dmitry Antipov <dantipov@nvidia.com>
Reviewed-by: Andrey Trachenko <atrachenko@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>