spi: bcm63xx-hsspi: Endianness fix for ARM based SoC

HSSPI controller uses big endian for the opcode in the message to the
controller ping pong buffer. Use cpu_to_be16 to properly handle the
endianness for both big and little endian host.

Fixes: 142168e ("spi: bcm63xx-hsspi: add bcm63xx HSSPI driver")
Signed-off-by: Kursad Oney <kursad.oney@broadcom.com>
Signed-off-by: William Zhang <william.zhang@broadcom.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>

Link: https://lore.kernel.org/r/20230207065826.285013-7-william.zhang@broadcom.com
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-bcm63xx-hsspi.c

@@ -194,7 +194,7 @@ static int bcm63xx_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t)
 			tx += curr_step;
 		}
 
-		__raw_writew(opcode | curr_step, bs->fifo);
+		__raw_writew((u16)cpu_to_be16(opcode | curr_step), bs->fifo);
 
 		/* enable interrupt */
 		__raw_writel(HSSPI_PINGx_CMD_DONE(0),