Merge "simpleperf: move GetBuildId* functions inside ElfFile class." am: 77458444fc am: c88aefd17e am: 02cc5da492

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/1352630

Change-Id: Ic0a48557d19fb97593fa7580fec95d3c85e1b5d2