ubootchart: delete ubootchart recipe

ubootchart: delete ubootchart recipe

The Ubootchart recipe had known issues. Ubootchart itself is no longer updated
upstream. Ubootchart is also now redundant with Bootchart2.

If people still want ubootchart around, it can be moved to meta-oe.

Ubootchart removed as part of the solution to [YOCTO #5893].

(From OE-Core rev: 8be891cd4beacc4157158808012179c35b433e4a)

Signed-off-by: Max Eliaser <max.eliaser@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>