ti-dsplink: Recipe rename, remove module.bbclass dependence, refactor variables

ti-dsplink: Recipe rename, remove module.bbclass dependence, refactor variables

    * Remove module.bbclass, since building user + kernel + dsp, etc
    * Add necessary module aware pieces (KERNEL_VERSION, pre/post inst)
    * Rename apps to examples to align with other recipes
    * Variable refactoring, moving DSPLINK specifics into this recipe
    * Move 'clean' steps into prepsources and clean all
    * Change XDC .interfaces to .make for consistency
    * Prepare stage for cleaning common include files

Signed-off-by: Roger Monk <r-monk@ti.com>