spi: pl022: Rename flush into pl022_spi_flush

Rename the flush function into pl022_spi_flush to avoid conflicting
types with previous declaration of the function in stdio.h header.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/drivers/spi/pl022_spi.c b/drivers/spi/pl022_spi.c
index 2986c4e..a6a0c55 100644
--- a/drivers/spi/pl022_spi.c
+++ b/drivers/spi/pl022_spi.c
@@ -107,7 +107,7 @@
 	return 0;
 }
 
-static void flush(struct pl022_spi_slave *ps)
+static void pl022_spi_flush(struct pl022_spi_slave *ps)
 {
 	do {
 		while (readw(ps->base + SSP_SR) & SSP_SR_MASK_RNE)
@@ -126,7 +126,7 @@
 	reg |= SSP_CR1_MASK_SSE;
 	writew(reg, ps->base + SSP_CR1);
 
-	flush(ps);
+	pl022_spi_flush(ps);
 
 	return 0;
 }
@@ -137,7 +137,7 @@
 	struct pl022_spi_slave *ps = dev_get_priv(bus);
 	u16 reg;
 
-	flush(ps);
+	pl022_spi_flush(ps);
 
 	/* Disable the SPI hardware */
 	reg = readw(ps->base + SSP_CR1);