Restructure fwu-app deployment

Change fwu-app deployment to be more consistent to existing
deployments:
  - change fwu-app to be a dedicated deployment instead of a
    configuration of an SP.  Change the name to "fwu-tool".
	Change the name of the executable to the same.
  - delete posix environment and:
      - move posix trace implementation to linux-pc environment
	  - move deployment specific files to the deployment directory
  - move fwu-app common files from components/service/fwu/app to
    the new deployment, under src/app

Change-Id: Icf68d39bda34092807f33256f540389cd82d0a46
Signed-off-by: Gyorgy Szing <Gyorgy.Szing@arm.com>
24 files changed