Suppress fortify-source warning

Found by clang-r510928:

AidlConversionCppNdk.cpp:1083:13: error: 'snprintf' will always be truncated; specified size is 32, but format string expands to at least 40 [-Werror,-Wfortify-source]
 1083 |             snprintf(addressBuffer, AUDIO_DEVICE_MAX_ADDRESS_LEN,
      |             ^

Test: presubmit
Change-Id: Iad914e5f5ca642e05fadb442a258ed3828388898