media: cec: core: add rx-no-low-drive setting

media: cec: core: add rx-no-low-drive setting

If rx-no-low-drive is set, then the CEC pin framework will disable
the detection of situations where a Low Drive has to be generated.

So if this is set, then we will never generate Low Drives.

This helps testing whether other CEC devices generate Low Drive
pulses by ensuring it is not us that is generating them.

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