msm: Rename msmfalcon to sdm660

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

Conflicts:
	configs/sdm660/sdm660.mk

Change-Id: I5fc11ffac2f21f11e2a7283cf7375bcf93c01623
30 files changed