scripts: runners: nrf_common: Fix recover on 54H20

In order for the --recover option to work properly on the nRF54H20, it
requires executing it for both cores, the radio and the application one.
Extend the recover_target() function so that it does so for both 53 and
54H20.

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