Fix vaQueryImageFormats() to return 0 image formats supported at this time.
Fix vaQueryImageFormats() to return 0 image formats supported at this time.

CyanogenMod/android_hardware_intel_libva,01org/iotg-lin-gfx-libva,Distrotech/libva,Distrotech/libva,01org/iotg-lin-gfx-libva,01org/iotg-lin-gfx-libva,gbeauchesne/libva,chenxianqin/vaapi-libva,halleyzhao/libva-fdo,pma1/libva,CyanogenMod/android_hardware_intel_libva,Distrotech/libva,zzhhui/libva,gbeauchesne/libva,android-ia/hardware_intel_libva,android-ia/hardware_intel_libva,01org/libva-cros,zzhhui/libva,01org/libva-cros,pma1/libva,gbeauchesne/libva,pma1/libva,halleyzhao/libva-fdo,zzhhui/libva,CyanogenMod/android_hardware_intel_libva,halleyzhao/libva-fdo,chenxianqin/vaapi-libva,01org/libva-cros,chenxianqin/vaapi-libva,android-ia/hardware_intel_libva