Added helper Kcoinfig option USE_ISR_WRAPPER which can be used to include isr_wrapper even if GEN_SW_ISR_TABLE is not enabled. This is needed to enable configurations where only IRQ vector table is used with multithreading (only direct isr used). This change is backward compatibible with previous config. Signed-off-by: Łukasz Stępnicki <lukasz.stepnicki@nordicsemi.no>