simpleperf: fix dumping arm regs on arm64 devices.

On arm64 devices, the kernel dumps arm64 regs
even for 32-bit processes. So we need to map
from arm64 registers to arm registers.

Bug: http://b/30974693
Test: run simpleperf manually on one app.
Change-Id: Iffeac9510b418b5dabc0604c16523887d63bba49
10 files changed