arm: Provide common PSCI based reset handler
Most armv8 systems have PSCI support enabled in EL3, either through ARM Trusted Firmware or other firmware. On these systems, we do not need to implement system reset manually, but can instead rely on higher level firmware to deal with it. The exclude list seems excessive right now, but NXP is working on providing an in-tree PSCI implementation, so that all NXP systems can eventually use PSCI as well. Signed-off-by: NAlexander Graf <agraf@suse.de> [agraf: fix meson] Reviewed-by: NSimon Glass <sjg@chromium.org>
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