xserver-kdrive: remove.

xserver-kdrive: remove.

kdrive is effectively unmaintained upstream (it's only kept for Xephyr).

Apart from two headless machines in meta-yocto (patches sent), every BSP I
looked at (oe-core, meta-intel, meta-oe, meta-ti, meta-smartphone) is using the
traditional X.org X server.  Changing kdrive to Xorg means an extra ~200kb of
disk usage but extra features and more importantly continued maintenance.

(From OE-Core rev: f8bc059883a9bae92434bfb74fca352ad1e10199)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>