Remove arm-specific -Wno-psabi

This flag was added to stop a GCC 4.4 specific warning. Since we've
upgraded, this flag is no longer necessary. It's already stripped for
clang builds, and I found no instances in the logs after removing it.

Change-Id: If5316d2eb8066dc43d7af7aebc7e4920b4ada192
2 files changed