fbdev/hecubafb: Generate deferred I/O ops

Use the existing generator macros to create deferred-I/O helpers
for hecubafb and set them in the fb_ops structure. Functions
for damage handling on memory ranges and areas are provided by
the driver.

Hecubafb's implementation of fb_write writes to system memory,
so the generated code can use the respective helper internally.
This also fixes a long-standing bug where fb_write returned an
errno code instead of the number of written bytes. See the commit
message of commit 921b7383f348 ("fbdev: Return number of bytes
read or written") for more details.

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Sam Ravnborg <[email protected]>
Acked-by: Helge Deller <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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