Update notes for submitted changes

* Change 64bit library path from /system/lib/ to /system/lib64
Update notes for submitted changes

* Enable 64bit elf object handling.
Update notes for submitted changes

* Update libbcc for 64-bit support.
Update notes for submitted changes

* CleanSpec for clang 3.5
Update notes for submitted changes

* Improve standalone bcc for on-device compilation.
Update notes for submitted changes

* Provide support for ARM on AArch64 builds as well.
Update notes for submitted changes

* Remove Makefile->Header code generation from libbcc.
Update notes for submitted changes

* Provide target-specific defines for libbcc and other libraries.
Update notes for submitted changes

* Add options to device bcc for specifying the target architecture.
Update notes for submitted changes

* Use ARCH_ARM_HAVE_NEON define instead of cpuinfo to detect NEON support.