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>
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index f09e138..4be7433 100644
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -101,6 +101,12 @@
 	help
 	  Reboot support for generic watchdog reset.
 
+config SYSRESET_RESETCTL
+	bool "Enable support for reset controller reboot driver"
+	select DM_RESET
+	help
+	  Reboot support using generic reset controller.
+
 config SYSRESET_X86
 	bool "Enable support for x86 processor reboot driver"
 	depends on X86