ABI: Add initial ABI definition based on gki_defconfig

Add initial ABI definition file based on gki_defconfig.
This denition file is used in the automation while the
new changes are merge into the kernel. This process
detects ABI break if the new changes are introduced
any API/structure changes which could impact the other
exported functions or modules.

This initial snapshot is taken from the commit 553049f8.

Initial definition present in the current directory is
also based on gki_config i.e abi_gki_aarch64.out, But
this definition can't be used for ABI comparision because
of compiler being used to generate this file could be
different. Hence generate the one by our own and maintain
the same.

Change-Id: I3a5a744e81a004659065c1b44c98baddfa242fbb
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>