video: fbdev: sis: Fix set but not used warnings in init.c

Fix "set but not used" warnings by removing the code the assign the
variables and the definition of the variables.
A register read is kept as it may have unknown side-effects.

This removes a lot of unused code - which is always a good thing to do.

v2:
  - Updated subject (Lee)

Signed-off-by: Sam Ravnborg <[email protected]>
Acked-by: Thomas Zimmermann <[email protected]>
Cc: Thomas Winischhofer <[email protected]>
Cc: Lee Jones <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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