cpu/nrf53: add initial Kconfig

Signed-off-by: Dylan Laduranty <dylan.laduranty@mesotic.com>

cpu/nrf53/Kconfig

@@ -0,0 +1,39 @@
+# Copyright (c) 2023 Mesotic SAS
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+config CPU_FAM_NRF53
+    bool
+    select CPU_COMMON_NRF5X
+    select HAS_CORTEXM_MPU
+    select HAS_CPU_NRF53
+
+## CPU Models
+config CPU_MODEL_NRF5340XXAA
+    bool
+    select CPU_CORE_CORTEX_M33
+    select CPU_FAM_NRF53
+
+## CPU common symbols
+config CPU_FAM
+    default "nrf53" if CPU_FAM_NRF53
+
+config CPU_MODEL
+    default "nrf5340xxaa" if CPU_MODEL_NRF5340XXAA
+
+
+config CPU
+    default "nrf53" if CPU_FAM_NRF53
+
+## Definition of specific features
+config HAS_CPU_NRF53
+    bool
+    help
+        Indicates that the current cpu is 'nrf53'.
+
+rsource "periph/Kconfig"
+rsource "vectors/Kconfig"
+
+source "$(RIOTCPU)/nrf5x_common/Kconfig"