viafb: Unify duplicated set_bpp() code
As suggested by Florian: make both mode-setting paths use the same code.
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: ScottFang@viatech.com.cn
Cc: JosephChan@via.com.tw
Signed-off-by: NJonathan Corbet <corbet@lwn.net>
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