target/xtensa: Convert to 3-phase reset

target/xtensa: Convert to 3-phase reset

Convert the xtensa CPU class to use 3-phase reset, so it doesn't
need to use device_class_set_parent_reset() any more.

Signed-off-by: Peter Maydell <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Reviewed-by: Alistair Francis <[email protected]>
Reviewed-by: Cédric Le Goater <[email protected]>
Reviewed-by: Edgar E. Iglesias <[email protected]>
Reviewed-by: Taylor Simpson <[email protected]>
Reviewed-by: Greg Kurz <[email protected]>
Reviewed-by: Mark Cave-Ayland <[email protected]>
Message-id: 20221124115023.2437291[email protected]