Reland "Change HIDL fmq tests to use int32_t for payload" am: 7a26802481 am: 8980ac3b5f am: 99ace1c2f4 am: 7178223c75 am: 599e196d74

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1434353

Change-Id: I955ec3bb3fb375f2405519cdd9b02612cceb8959