board: rzg2l: Support reset via Renesas RAA215300 PMIC

With the SYSRESET subsystem enabled we do not need to implement
reset_cpu() in the board directory.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/board/renesas/rzg2l/rzg2l.c b/board/renesas/rzg2l/rzg2l.c
index 73201a8..0f6d6e7 100644
--- a/board/renesas/rzg2l/rzg2l.c
+++ b/board/renesas/rzg2l/rzg2l.c
@@ -56,11 +56,3 @@
 {
 	return 0;
 }
-
-void reset_cpu(void)
-{
-	/*
-	 * TODO: Implement reset support once TrustedFirmware supports
-	 * the appropriate call.
-	 */
-}
diff --git a/configs/renesas_rzg2l_smarc_defconfig b/configs/renesas_rzg2l_smarc_defconfig
index 2cab7932..21365a2 100644
--- a/configs/renesas_rzg2l_smarc_defconfig
+++ b/configs/renesas_rzg2l_smarc_defconfig
@@ -55,3 +55,5 @@
 CONFIG_DM_REGULATOR=y
 CONFIG_DM_REGULATOR_FIXED=y
 CONFIG_DM_REGULATOR_GPIO=y
+CONFIG_SYSRESET=y
+CONFIG_SYSRESET_RAA215300=y