net: dsa: sja1105: constify the sja1105_regs structures

The struct sja1105_regs tables are not modified during the runtime of
the driver, so they can be made constant. In fact, struct sja1105_info
already holds a const pointer to these.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/sja1105/sja1105_spi.c

@@ -404,7 +404,7 @@ int sja1105_static_config_upload(struct sja1105_private *priv)
 	return rc;
 }
 
-static struct sja1105_regs sja1105et_regs = {
+static const struct sja1105_regs sja1105et_regs = {
 	.device_id = 0x0,
 	.prod_id = 0x100BC3,
 	.status = 0x1,
@@ -440,7 +440,7 @@ static struct sja1105_regs sja1105et_regs = {
 	.mdio_100base_t1 = SJA1105_RSV_ADDR,
 };
 
-static struct sja1105_regs sja1105pqrs_regs = {
+static const struct sja1105_regs sja1105pqrs_regs = {
 	.device_id = 0x0,
 	.prod_id = 0x100BC3,
 	.status = 0x1,
@@ -479,7 +479,7 @@ static struct sja1105_regs sja1105pqrs_regs = {
 	.mdio_100base_t1 = SJA1105_RSV_ADDR,
 };
 
-static struct sja1105_regs sja1110_regs = {
+static const struct sja1105_regs sja1110_regs = {
 	.device_id = SJA1110_SPI_ADDR(0x0),
 	.prod_id = SJA1110_ACU_ADDR(0xf00),
 	.status = SJA1110_SPI_ADDR(0x4),