arch: aarch32: Add build asserts for IRQ priority range

Figuring out what the lowest possible priority in platforms where
CONFIG_ZERO_LATENCY_IRQS is supported is not possible before the Kconfig
tree is built and resolved. In order to make the user's life easier,
abort the build if IRQ_CONNECT() is called with an invalid (i.e. too
low) priority.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>