frameworks/native: Include stdint.h for int32_t type

This commit fixes the following compiler error with gcc 14.2.0.

native/include/android/configuration.h:531:1: error: 'int32_t' does not name a type
  531 | int32_t AConfiguration_getMcc(AConfiguration* config);
      | ^~~~~~~
native/include/android/configuration.h:536:52: error: 'int32_t' has not been declared
  536 | void AConfiguration_setMcc(AConfiguration* config, int32_t mcc);
      |                                                    ^~~~~~~

Change-Id: I11fd658d799801fb6267ab48d4a890cab2086121