staging: mt7621-mmc: Remove unused macro msdc_fifo_write32

The macro msdc_fifo_write32 is never used, so remove it.
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/sd.c

@@ -149,7 +149,6 @@ static int msdc_rsp[] = {
 
 #define msdc_txfifocnt()   ((sdr_read32(MSDC_FIFOCS) & MSDC_FIFOCS_TXCNT) >> 16)
 #define msdc_rxfifocnt()   ((sdr_read32(MSDC_FIFOCS) & MSDC_FIFOCS_RXCNT) >> 0)
-#define msdc_fifo_write32(v)   sdr_write32(MSDC_TXDATA, (v))
 #define msdc_fifo_read32()   sdr_read32(MSDC_RXDATA)
 
 #define msdc_dma_on()        sdr_clr_bits(MSDC_CFG, MSDC_CFG_PIO)