sysreset: Support reset via Renesas RAA215300 PMIC

This patch adds support for resetting a board via the RAA215300 PMIC.

Note that the RAA215300 documentation names the available reset types
differently to u-boot:

  * A "warm" reset via the RAA215300 PMIC will fully reset the SoC
    (CPU & GPIOs), so this corresponds to SYSRESET_COLD.

  * A "cold" reset via the RAA215300 PMIC will cycle all power supply
    rails, so this corresponds to SYSRESET_POWER.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index 0e52f99..49c0787 100644
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -229,6 +229,12 @@
 	help
 	  Reboot support for NXP MPC83xx SoCs.
 
+config SYSRESET_RAA215300
+	bool "Support sysreset via Renesas RAA215300 PMIC"
+	depends on PMIC_RAA215300
+	help
+	  Add support for the system reboot via the Renesas RAA215300 PMIC.
+
 endif
 
 endmenu