fbcon: Rename struct fbcon_ops to struct fbcon_par

fbcon: Rename struct fbcon_ops to struct fbcon_par

The type struct fbcon_ops contains fbcon state and callbacks. As the
callbacks will be removed from struct fbcon_ops, rename the data type
to struct fbcon_par. Also rename the variables from ops to par.

The _par postfix ("private access registers") is used throughout the
fbdev subsystem for per-driver state. The fbcon pointer within struct
fb_info is also named fbcon_par. Hence, the new naming fits existing
practice.

v2:
- rename struct fbcon_ops to struct fbcon_par
- fix build for CONFIG_FB_TILEBITTING=n (kernel test robot)
- fix indention

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://lore.kernel.org/r/20250909124616.143365-3-tzimmermann@suse.de