stm32f429i target: early_boot.c refactor

Change-Id: Id7c03621a1bfe1fd3fdb6b6e8bfbd71703edbabd
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/14261
Reviewed-by: Alexei Frolov <frolv@google.com>
Reviewed-by: Armando Montanez <amontanez@google.com>
Commit-Queue: Chenghan Zhou <chenghanzh@google.com>
diff --git a/pw_sys_io_baremetal_stm32f429/BUILD.gn b/pw_sys_io_baremetal_stm32f429/BUILD.gn
index f4a652e..9df8bbf 100644
--- a/pw_sys_io_baremetal_stm32f429/BUILD.gn
+++ b/pw_sys_io_baremetal_stm32f429/BUILD.gn
@@ -17,26 +17,20 @@
 
 import("$dir_pw_build/target_types.gni")
 import("$dir_pw_docgen/docs.gni")
-import("$dir_pw_malloc/backend.gni")
-config("pw_malloc_active") {
-  if (pw_malloc_BACKEND != "") {
-    defines = [ "PW_MALLOC_ACTIVE=1" ]
-  }
+config("default_config") {
+  include_dirs = [ "public" ]
 }
 
 pw_source_set("pw_sys_io_baremetal_stm32f429") {
-  configs = [ ":pw_malloc_active" ]
+  public_configs = [ ":default_config" ]
+  public = [ "public/pw_sys_io_baremetal_stm32f429/init.h" ]
   public_deps = [ "$dir_pw_boot_armv7m" ]
   deps = [
-    "$dir_pw_malloc",
     "$dir_pw_preprocessor",
     "$dir_pw_sys_io:default_putget_bytes",
     "$dir_pw_sys_io:facade",
   ]
-  sources = [
-    "early_boot.c",
-    "sys_io_baremetal.cc",
-  ]
+  sources = [ "sys_io_baremetal.cc" ]
 }
 
 pw_doc_group("docs") {