[platform] fix compiling issue when use SuccessOrDie (#9640)

Missing a header file included in the file `exit_code.h`, and
'otLogCritPlat' will not be declared. If using the function
`SuccessOrDie` with only inlcude the file
`src/lib/platform/exit_code.h`, it will have a compiling error
`'otLogCritPlat' was not declared in this scope`.

src/lib/platform/BUILD.gn

@@ -38,5 +38,6 @@ config("platform_config") {
 
 static_library("libopenthread-platform") {
   sources = platform_sources
+  public_deps = [ "../../core:libopenthread_core_headers" ]
   public_configs = [ ":platform_config" ]
 }

src/lib/platform/exit_code.h

@@ -38,6 +38,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <openthread/logging.h>
 #ifdef __cplusplus
 extern "C" {
 #endif