media: pci: saa7146: hexium_orion: initialize input 0

When this driver is loaded for the first time, input 0 is
not initialized. In order to capture from that input you would
have to switch to input 1, then back to 0.

Properly initialize the input when the driver is loaded.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>