cpu/atmega328p: Add Kconfig symbols

cpu/atmega328p/Kconfig

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+# Copyright (c) 2020 HAW Hamburg
+#
+# 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_ATMEGA328
+    bool
+    select CPU_COMMON_ATMEGA
+    select HAS_ATMEGA_PCINT1
+    select HAS_ATMEGA_PCINT2
+
+## CPU Models
+config CPU_MODEL_ATMEGA328P
+    bool
+    select CPU_FAM_ATMEGA328
+    select HAS_CPU_ATMEGA328P
+
+## Definition of specific features
+config HAS_CPU_ATMEGA328P
+    bool
+    help
+        Indicates that a 'atmega328p' cpu is being used.
+
+## Common CPU symbols
+config CPU_FAM
+    default "atmega328" if CPU_FAM_ATMEGA328
+
+config CPU_MODEL
+    default "atmega328p" if CPU_MODEL_ATMEGA328P
+
+config CPU
+    default "atmega328p" if CPU_FAM_ATMEGA328
+
+source "$(RIOTCPU)/atmega_common/Kconfig"