video: fbdev: sstfb: Updated logging to fix set but not used warnings

Fix set but not used warnings by introducing no_printk variants
for the internal logging system for this driver.

Fix a new warning that popped up now that logging was checked for
correct printf format strings.

A more invasive fix had been to replace all the internal logging with
standard logging primitives - thats for another day.

v2:
  - Update subject (Lee)

Signed-off-by: Sam Ravnborg <[email protected]>
Acked-by: Thomas Zimmermann <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Bartlomiej Zolnierkiewicz <[email protected]>
Cc: Alex Dewar <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: [email protected]
Cc: Lee Jones <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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