media: v4l2 uapi book: get rid of driver programming's chapter

It doesn't make any sense having a driver programming's chapter
at the uAPI book, as this is related to kernel API. Also,
we now have such kAPI book where V4L2 driver programming is covered.

So, get rid of this left-over.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>