mpv: disable mali-fbdev support

Fixes:
http://autobuild.buildroot.net/results/2ce/2ce2d9be9e0699114e3bc3c0434ba05f64741f89/



A compile error occurs when attempting to compile mpv with mali support
(eg. when odroid-mali package is selected).

Signed-off-by: Mahyar Koshkouei <mahyar.koshkouei@gmail.com>
Signed-off-by: Mahyar Koshkouei <&amp;lt;mahyar.koshkouei@gmail.com&amp;gt;&lt;br/>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>