[media] IR: ene_ir: updates

* Add support for newer firmware version that uses different
buffer format. Makes hardware work for many users.

* Register name updates

* Lot of refactoring

* Lots of fixes as a result of full testing

* Idle mode is done now by resetting the device, and this eliminates
the ugly sample_period = 75 hack.

Every feature of the driver is now well tested.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>