spi: spi-mem: zynq-qspi: Fix build error on architectures missing readsl/writesl

Alpha and some of the architectures are missing readsl/writesl functions.
so the zynq-qspi driver won't be able to build on these arches. hence use
ioread32_rep()/iowrite32_rep() instead of readsl()/writesl().
Signed-off-by: Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-zynq-qspi.c

@@ -407,7 +407,7 @@ static void zynq_qspi_write_op(struct zynq_qspi *xqspi, int txcount,
 		count = txcount;
 
 	if (xqspi->txbuf) {
-		writesl(xqspi->regs + ZYNQ_QSPI_TXD_00_00_OFFSET,
+		iowrite32_rep(xqspi->regs + ZYNQ_QSPI_TXD_00_00_OFFSET,
 			      xqspi->txbuf, count);
 		xqspi->txbuf += count * 4;
 	} else {
@@ -433,7 +433,7 @@ static void zynq_qspi_read_op(struct zynq_qspi *xqspi, int rxcount)
 	if (count > rxcount)
 		count = rxcount;
 	if (xqspi->rxbuf) {
-		readsl(xqspi->regs + ZYNQ_QSPI_RXD_OFFSET,
+		ioread32_rep(xqspi->regs + ZYNQ_QSPI_RXD_OFFSET,
 			     xqspi->rxbuf, count);
 		xqspi->rxbuf += count * 4;
 	} else {