soc: arm: smartbond: Add support for extended sleep

This enabled extended sleep for Renesas SmartBond(tm).

Extended sleep is low power mode where ARM core is powered off and can
be woken up by PDC. This is default sleep mode when CONFIG_PM is
enabled.

Signed-off-by: Andrzej Kaczmarek <andrzej.kaczmarek@codecoup.pl>
Signed-off-by: Jerzy Kasenberg <jerzy.kasenberg@codecoup.pl>
6 files changed