cmake: fix include directories to work with out-of-tree arch

Include directories for ${ARCH} is not specified correctly.
Several places in Zephyr, the include directories are specified as:
${ZEPHYR_BASE}/arch/${ARCH}/include
the correct line is:
${ARCH_DIR}/${ARCH}/include
to correctly support out of tree archs.

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

arch/CMakeLists.txt

@@ -4,7 +4,7 @@ add_definitions(-D__ZEPHYR_SUPERVISOR__)
 
 include_directories(
   ${ZEPHYR_BASE}/kernel/include
-  ${ZEPHYR_BASE}/arch/${ARCH}/include
+  ${ARCH_DIR}/${ARCH}/include
   )
 
 add_subdirectory(common)

kernel/CMakeLists.txt

@@ -63,7 +63,7 @@ target_sources_ifdef(
 
 target_include_directories(kernel PRIVATE
   ${ZEPHYR_BASE}/kernel/include
-  ${ZEPHYR_BASE}/arch/${ARCH}/include
+  ${ARCH_DIR}/${ARCH}/include
   )
 
 add_dependencies(kernel zephyr_generated_headers)

lib/posix/CMakeLists.txt

@@ -30,7 +30,7 @@ endif()
 
 zephyr_library_include_directories(
   ${ZEPHYR_BASE}/kernel/include
-  ${ZEPHYR_BASE}/arch/${ARCH}/include
+  ${ARCH_DIR}/${ARCH}/include
 )
 
 zephyr_library_link_libraries(posix_subsys)

subsys/net/ip/CMakeLists.txt

@@ -46,7 +46,7 @@ endif()
 
 zephyr_library_include_directories(
   ${ZEPHYR_BASE}/kernel/include
-  ${ZEPHYR_BASE}/arch/${ARCH}/include
+  ${ARCH_DIR}/${ARCH}/include
   )
 
 if(CONFIG_NET_SHELL)

subsys/tracing/CMakeLists.txt

@@ -41,7 +41,7 @@ endif()
 zephyr_include_directories_ifdef(
   CONFIG_TRACING
   ${ZEPHYR_BASE}/kernel/include
-  ${ZEPHYR_BASE}/arch/${ARCH}/include
+  ${ARCH_DIR}/${ARCH}/include
 )
 
 zephyr_include_directories_ifdef(CONFIG_TRACING include)

subsys/tracing/ctf/CMakeLists.txt

@@ -4,7 +4,7 @@ zephyr_sources(ctf_top.c)
 
 zephyr_include_directories(
   ${ZEPHYR_BASE}/kernel/include
-  ${ZEPHYR_BASE}/arch/${ARCH}/include
+  ${ARCH_DIR}/${ARCH}/include
   )
 
 zephyr_include_directories(.)