soc: nordic: common: Introduce NRF_DT_(INST)_IRQ_ utility macros

Introduce the NRF_DT_IRQ_DIRECT_DEFINE and NRF_DT_IRQ_CONNECT macros
which reduce provide a common way for nordic drivers to adapt to the
presence of the SW ISR table which is commonly excluded as it is not
required for nordic socs. Also adds device driver inst variants of
the macros.

Signed-off-by: Bjarki Arge Andreasen <bjarki.andreasen@nordicsemi.no>