Cannot use PULP toolchain for interrupt_test

Created by: mp-17

The interrupt_test does not work with the PULP toolchain, because:

1. The PULP toolchain cannot handle arguments to __attribute__((interrupt(ARG))). A possible solution is not to give ARG.
2. The PULP toolchain cannot handle function calls inside interrupt functions (e.g. software_irq_handler calls printf).

The official riscv-toolchain works as expected, though.