mesa: provide support for packing development and testing tools

mesa: provide support for packing development and testing tools

Mesa contains several optional tools that can be useful for application
and driver developers. Add a packageconfig option to build a mesa-tools
package containing relevant programs.

Note, the fdperf tool for the freedreno depends on libconfig, which is
not a part of oe-core, thus this tool is not built by default by this
recipe even when freedreno driver is selected. The fdperf tool needs to
be explicitly enabled by adding 'freedreno-fdperf' to the PACKAGECONFIG.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>