drm/solomon: Enforce one assignment per line

drm/solomon: Enforce one assignment per line

The code contains several instances of chained assignments. The Linux
kernel coding style generally favors clarity and simplicity over terse
syntax. Refactor the code to use a separate line for each assignment.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Iker Pedrosa <ikerpedrosam@gmail.com>
Link: https://lore.kernel.org/r/20250920-improve-ssd130x-v2-5-77721e87ae08@gmail.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>