powerpc/xive: Introduce an helper to print out interrupt characteristics

and extend output of debugfs and xmon with addresses of the ESB
management and trigger pages.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211105102636.1016378-3-clg@kaod.org