recipes: Remove protocol=git parameter

* this is default for git fetcher
* makes it easier to change OPENWEBOS_GIT_REPO to private repo
  with protocol=ssh
* deliberately not incrementing PR as this change has no effect on what
  is built

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@palm.com>
Change-Id: Ib43b1934fb731c8401a56d7da362bc67433e756d
Reviewed-on: https://g2g.palm.com/1685
Reviewed-by: Herb Kuta <herb.kuta@lge.com>
Reviewed-by: Martin Jansa <martin.jansa@palm.com>
Tested-by: Martin Jansa <martin.jansa@palm.com>
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>