xserver-xf86-config: set DefaultDepth to 16 for qemumips

Apparently, the default qemumips color depth was set to 8 and the colors were not
displayed properly. cirrusfb driver doensn't seem to accept color depth
as a kernel parameter, so we have to do it here.

[YOCTO #4340]

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
udev: drop dependency on udev in libudev

libudev previously depended on udev, but this causes problems with multilib
if the user wants to install two variants of libudev as they'll pull in two
variants of udev, which will conflict.

Instead, remove the dependency and rely that the image pulls in udev in some
way, such as the commonly used packagegroup-core-boot.

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

If we want systemd support we use systemd's udev, so disable systemd
support in this udev to avoid packaging the unit files.

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

Although libgcrypt support is optional, its development files are
are always required to expand AM_PATH_LIBGCRYPT.  Build might fails else
with

| libtoolize: copying file `m4/lt~obsolete.m4'
| configure.ac:446: warning: macro 'AM_PATH_LIBGCRYPT' not found in library
| ...
| configure.ac:446: error: possibly undefined macro: AM_PATH_LIBGCRYPT
| autoreconf: .../autoconf failed with exit status: 1
| + bbfatal 'autoreconf execution failed.'
| + echo 'ERROR: autoreconf execution failed.'

Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>