[media] DocBook: move FE_GET_PROPERTY to its own xml file

That helps the xref logic at the Makefile to point to the
right place. Also, it becomes more organized and easier to
maintain if each ioctl have its own xml file.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --cc Documentation/DocBook/media/dvb/dvbproperty.xml
Simple merge

diff --cc Documentation/DocBook/media/dvb/fe-get-property.xml
Simple merge