tests: Bluetooth: ISO: BIS: Enable BIS test for nRF5340bsim

Enable support for building and running the BIS ISO host test
on the nRF5340bsim board.

The purpose of this is to test the ISO fragmentation on both the
nRF52bsim and nRF5340bsim, as they use different drivers.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>