media/ivtvfb: Initialize fb_ops to fbdev I/O-memory helpers

Initialize the instance of struct fb_ops with fbdev initializer
macros for framebuffers in I/O address space. This explictily sets
the read/write, draw and mmap callbacks to the correct default
implementation.

Fbdev drivers sometimes rely on the callbacks being NULL for a
default implementation to be invoked; hence requireing the I/O
helpers to be built in any case. Setting all callbacks in all
drivers explicitly will allow to make the I/O helpers optional.
This benefits systems that do not use these functions.

Set the callbacks via macros. No functional changes.

Signed-off-by: Thomas Zimmermann <[email protected]>
Cc: Andy Walls <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: [email protected]
Reviewed-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Hans Verkuil <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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