nrf52_bsim: Do not load Tsymbols from main

We do not use them for anything yet, but they do
use a lot of heap, specially for the networking apps
with openthread.
If we need them later we can always add it again.

Moreover, there is an issue is this bsim component
detected by ASAN when loading symbols with too long names,
the issue is fixed in the master branch, but better
if users do not need to update for a component which
is not used.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>