Create a macro implementing a standard method to share state amongst
multiple instances of a hybrid tuner object.

Also, prepare tuner_foo printk macros for the removal of PREFIX
Signed-off-by: NMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>