cpu/arm7_common: Add Kconfig symbols

HAS_ARCH_ARM features now is moved to Kconfig.features as it is being
used by multiple architectures.

cpu/arm7_common/Kconfig

@@ -0,0 +1,33 @@
+# 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_ARCH_ARMV4T
+    bool
+    select HAS_ARCH_32BIT
+    select HAS_ARCH_ARM
+    select HAS_CPP
+
+config CPU_CORE_ARM7TDMI_S
+    bool
+    select CPU_ARCH_ARMV4T
+    select HAS_ARCH_ARM7
+    select HAS_PERIPH_PM
+    select HAS_PUF_SRAM
+    select HAS_SSP
+
+## Declaration of specific features
+config HAS_ARCH_ARM7
+    bool
+    help
+        Indicates that the core is part of the ARM7 group of cores.
+
+## Common CPU symbols
+config CPU_ARCH
+    default "armv4t" if CPU_ARCH_ARMV4T
+
+config CPU_CORE
+    default "arm7tdmi_s" if CPU_CORE_ARM7TDMI_S

cpu/arm7_common/Makefile.features

@@ -1,3 +1,6 @@
+CPU_ARCH = armv4t
+CPU_CORE = arm7tdmi_s
+
 FEATURES_PROVIDED += arch_32bit
 FEATURES_PROVIDED += arch_arm
 FEATURES_PROVIDED += arch_arm7

cpu/cortexm_common/Kconfig

@@ -88,11 +88,6 @@ config HAS_CPU_CORE_CORTEXM
     help
         Indicates that the current CPU has an ARM Cortex-M core.
 
-config HAS_ARCH_ARM
-    bool
-    help
-        Indicates that the current architecture is ARM.
-
 config HAS_CORTEXM_FPU
     bool
     help

kconfigs/Kconfig.features

@@ -22,6 +22,11 @@ config HAS_ARCH_32BIT
     help
         Indicates that the CPU has a 32-bits architecture.
 
+config HAS_ARCH_ARM
+    bool
+    help
+        Indicates that the current architecture is ARM.
+
 config HAS_ARDUINO
     bool
     help