meta-agl-bsp: Update Beaglebone support for Kirkstone

meta-agl-bsp: Update Beaglebone support for Kirkstone

Changes:
- Update machine template to point into new meta-ti-bsp layer in the
  meta-ti repository, and update the dynamic layer directory name to
  match.
- meta-ti currently does not have Weston 10.0.0 support, and testing
  confirms it will not build against the currently provided version
  of the SGX GPU driver, so disable using it for now.
- Even though the GPU driver is not being used ATM, the local patch
  for ti-sgx-ddk-km to handle AGL toolchain naming has been updated
  to ease testing meta-ti updates down the road.
- The Weston bbappend that had been based on meta-arago's has been
  removed for now.  A re-evaluation of what is needed locally will
  need to be done when TI have their Weston 10.0.0 support settled.

Bug-AGL: SPEC-3819

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ie61cef722a643791970214710835423a21696694