boards: arm: xmc45_relax_kit: Convert to v2

Converts the board to hwmv2

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

boards/infineon/xmc45_relax_kit/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_XMC45_RELAX_KIT
 
-config BOARD
-	default "xmc45_relax_kit"
-
 if NETWORKING
 
 config NET_L2_ETHERNET

boards/infineon/xmc45_relax_kit/Kconfig.xmc45_relax_kit

@@ -4,6 +4,5 @@
 # Author: Parthiban Nallathambi <parthiban@linumiz.com>
 
 config BOARD_XMC45_RELAX_KIT
-	bool "Infineon Relax Kit"
+	select SOC_XMC4500
-	depends on SOC_SERIES_XMC_4XXX
 	select SOC_PART_NUMBER_F100X1024

boards/infineon/xmc45_relax_kit/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: xmc45_relax_kit
+  vendor: Infineon
+  socs:
+  - name: xmc4500

boards/infineon/xmc45_relax_kit/xmc45_relax_kit_defconfig

@@ -3,9 +3,6 @@
 # Copyright (c) 2020 Linumiz
 # Author: Parthiban Nallathambi <parthiban@linumiz.com>
 
-CONFIG_BOARD_XMC45_RELAX_KIT=y
-CONFIG_SOC_SERIES_XMC_4XXX=y
-CONFIG_SOC_XMC4500=y
 CONFIG_ARM_MPU=y
 
 # enable uart driver