staging: xgifb: rename SR15/SR13 arrays to SR18

Since we are programming SR register 18, better name structs/arrays
accordingly to avoid confusion.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 files changed