d3d9: Set RGBA4 to unknown
d3d9: Set RGBA4 to unknown

Color ordering of RGBA4 is wrong and there are no A4B4G4A4 format or swizzling
options.

jpcy/bgfx,emoon/bgfx,emoon/bgfx,jdryg/bgfx,LWJGL-CI/bgfx,LWJGL-CI/bgfx,jpcy/bgfx,emoon/bgfx,jdryg/bgfx,LWJGL-CI/bgfx,jpcy/bgfx,mendsley/bgfx,bkaradzic/bgfx,jdryg/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,bkaradzic/bgfx,mendsley/bgfx,jpcy/bgfx,bkaradzic/bgfx,mendsley/bgfx,jdryg/bgfx