MAINTAINERS: adjust entry in VIA UNICHROME(PRO)/CHROME9 FRAMEBUFFER DRIVER

Commit d4313a68 ("fbdev/media: Use GPIO descriptors for VIA GPIO")
moves via-gpio.h from include/linux to drivers/video/fbdev/via, but misses
to adjust the file entry for the VIA UNICHROME(PRO)/CHROME9 FRAMEBUFFER
DRIVER section.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

Remove the file entry in VIA UNICHROME(PRO)/CHROME9 FRAMEBUFFER DRIVER, as
the new location of the header is already covered by the file entry
drivers/video/fbdev/via/.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Fixes: d4313a68 ("fbdev/media: Use GPIO descriptors for VIA GPIO")
Signed-off-by: Helge Deller <deller@gmx.de>