udev-extraconf: Add rule adding input devices to input group

udev-extraconf: Add rule adding input devices to input group

Fixes [YOCTO 4164](2/3)

Add all /dev/input/* devices to the input group with g+rw.  This is
needed for rootless X without adding a security hole by making the
device o+rw.

(From OE-Core rev: 66c9b46f987f3e4f1f9b7b11d1ae157897454f07)

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Cc: Saul Wold <sgw@linux.intel.com>
Cc: Radu Moisan <radu.moisan@intel.com>
Cc: Ross Burton <ross.burton@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>