spi: spi-fsl-qspi: change i.MX7D RX FIFO size

The RX FIFO should be 128 byte rather than 512 byte. It's a typo on
reference manual.
Signed-off-by: Han Xu <han.xu@nxp.com>
Link: https://lore.kernel.org/r/20190710023128.13115-3-han.xu@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-fsl-qspi.c

@@ -206,7 +206,7 @@ static const struct fsl_qspi_devtype_data imx6sx_data = {
 };
 
 static const struct fsl_qspi_devtype_data imx7d_data = {
-	.rxfifo = SZ_512,
+	.rxfifo = SZ_128,
 	.txfifo = SZ_512,
 	.ahb_buf_size = SZ_1K,
 	.quirks = QUADSPI_QUIRK_TKT253890 | QUADSPI_QUIRK_4X_INT_CLK,