vc4: Fix accidental dropping of the low bits of the store tilebuffer packet.
vc4: Fix accidental dropping of the low bits of the store tilebuffer packet.

Notably this included the EOF flag (the other bits are the full buffer
dump selection, but we don't do full dumps), which caused the kernel
checking for frame completion to trigger.

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler