hw/dma/xilinx_axidma: Remove unused stream_halted() function

The stream_halted() function is never used; remove it.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

hw/dma/xilinx_axidma.c

@@ -157,11 +157,6 @@ static inline int stream_running(struct Stream *s)
     return s->regs[R_DMACR] & DMACR_RUNSTOP;
 }
 
-static inline int stream_halted(struct Stream *s)
-{
-    return s->regs[R_DMASR] & DMASR_HALTED;
-}
-
 static inline int stream_idle(struct Stream *s)
 {
     return !!(s->regs[R_DMASR] & DMASR_IDLE);