msm: Rename msmfalcon/apqfalcon to sdm660/sda660

Update the code name from msmfalcon/apqfalcon to sdm660/sda660.
As part of this, update the filename containing "falcon" and
files content containing "falcon".

Change-Id: Iec85862251b9e1b4dcc8bdce8b214ce87c0049bc
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>