Enable event tracing for Tizen.

[Dmitri-Botcharnikov]

This PR enables generation of LTTng event providers for Tizen platform by default.

[BruceForstall]

07:06:17 CMake Error at src/pal/src/configure.cmake:1346 (message):
07:06:17   Cannot find liblttng-ust-dev.  Try installing liblttng-ust-dev (or the
07:06:17   appropriate packages for your platform)
07:06:17 Call Stack (most recent call first):
07:06:17   src/pal/src/CMakeLists.txt:5 (include)

[BruceForstall]

cc @parjong @janvorli

Who is the best to review this?

[janvorli]

@BruceForstall, @Dmitri-Botcharnikov the change looks good, but it looks like we don't have the lttng-ust-dev package installed in the Tizen rootfs we are using and we need to add it.
Last time the rootfs was updated by @hqueue in a23cd52.

[hseok-oh]

As @janvorli said, we need to 1) fix rootfs script, and 2) update docker image for ci because lttng-ust-dev is not installed.

[hseok-oh]

If you want to enable this feature, you can simply remove this line.
FEATURE_EVENT_TRACE is set by default on Linux/ARM32.

[Dmitri-Botcharnikov]

@hseok-oh Thank you for suggestion, but I think it's more reliable to explicitly set feature on.

[hqueue]

@Dmitri-Botcharnikov @BruceForstall @janvorli @hseok-oh I'm now testing with new rootfs with lttng and will update docker image used for Tizen CI if there is no problem.

[Dmitri-Botcharnikov]

@hqueue Thank you! IMHO we need to add lttng-ust-dev package to tizen-fetch.sh script.

[hqueue]

I've just opened #14173. We have to wait CI testing completed for #14173 to see a new docker image working correctly.
It took some time to test rootfs and docker image locally and upload docker image for public use.

[hqueue]

@Dmitri-Botcharnikov #14173 is merged now. I think Tizen CI will work without problem after rebasing this PR to the latest master.

[Dmitri-Botcharnikov]

@dotnet-bot test Ubuntu16.04 armlb Cross Debug Build please

[Dmitri-Botcharnikov]

@dotnet-bot test Tizen armel Cross Release Build please

[Dmitri-Botcharnikov]

@hqueue Thank you!

[BruceForstall]

@janvorli Tests have passed; is this good to merge?