staging/sm750fb: Initialize fb_ops with fbdev macros

Initialize all instances of struct fb_ops with fbdev initializer
macros for framebuffers in I/O address space. Set the read/write,
draw and mmap callbacks to the correct implementation and avoid
implicit defaults. Also select the necessary helpers in Kconfig.

Fbdev drivers sometimes rely on the callbacks being NULL for a
default I/O-memory-based implementation to be invoked; hence
requiring 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.

Signed-off-by: Thomas Zimmermann <[email protected]>
Cc: Sudip Mukherjee <[email protected]>
Cc: Teddy Wang <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: [email protected]
Reviewed-by: Javier Martinez Canillas <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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