[RFC PATCH 0/4] si470x: clean up and use latest frameworks

[Hans Verkuil <hverkuil@xxxxxxxxx>]

This patch series updates the si470x driver so that it uses the latest
frameworks and passes the v4l2-compliance test tool.

It also removes usb autosuspend and the stop/start of the radio in the
release/open fops. It was very, very confusing that 'arecord -D ... | aplay'
didn't work unless you keep the radio0 node open (for no good reason other
then ensuring that the radio is started).

So the radio_start/stop code has been moved from open/release to
resume/suspend where it is used when you suspend the device. Note that
this change is for the USB version only, I did not touch the suspend/resume
code in the i2c version.

I've tested it all with my ADS InstantFM device.

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