boards: update Renesas Starter Kit+ for RZ/T2M board to HWMv2 scheme

This commit updates Renesas Starter Kit+ for RZ/T2M board to use HWMv2.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>

boards/arm/rzt2m_starterkit/Kconfig.board

@@ -1,6 +0,0 @@
-# Copyright (c) 2023 Antmicro <www.antmicro.com>
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_RZT2M_STARTER_KIT
-	bool "RZ/T2M Starter Kit Board"
-	depends on SOC_RENESAS_RZT2M

boards/arm/rzt2m_starterkit/Kconfig.defconfig

@@ -1,9 +0,0 @@
-# Copyright (c) 2023 Antmicro <www.antmicro.com>
-# SPDX-License-Identifier: Apache-2.0
-
-if BOARD_RZT2M_STARTER_KIT
-
-config BOARD
-	default "rzt2m_starter_kit"
-
-endif

boards/v2/renesas/rzt2m_starterkit/Kconfig.rzt2m_starter_kit

@@ -0,0 +1,6 @@
+# Copyright (c) 2023 Nordic Semiconductor ASA
+
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_RZT2M_STARTER_KIT
+	select SOC_RENESAS_RZT2M

boards/v2/renesas/rzt2m_starterkit/board.yml

@@ -0,0 +1,3 @@
+board:
+  name: rzt2m_starter_kit
+  vendor: Renesas

boards/v2/renesas/rzt2m_starterkit/rzt2m_starter_kit_defconfig

@@ -1,9 +1,6 @@
 # Copyright (c) 2023 Antmicro <www.antmicro.com>
 # SPDX-License-Identifier: Apache-2.0
 
-CONFIG_SOC_RENESAS_RZT2M=y
-CONFIG_BOARD_RZT2M_STARTER_KIT=y
-
 CONFIG_SERIAL=y
 CONFIG_CONSOLE=y
 CONFIG_UART_CONSOLE=y