sysreset: add reset controller based reboot driver

Some chips provide their sysreset function in reset controller, which is
normally a bit written to 1 to perform the sysreset.

This patch adds a new sysreset driver to take advantage of it.

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
3 files changed