net: phy: make addr type u8 in phy_package_shared struct

Switch addr type in phy_package_shared struct to u8.

The value is already checked to be non negative and to be less than
PHY_MAX_ADDR, hence u8 is better suited than using int.

Signed-off-by: Christian Marangi <[e-mail]>
Reviewed-by: Russell King (Oracle) <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/linux/phy.h

···
  * phy_package_leave().
  */
 struct phy_package_shared {
-	int addr;
+	u8 addr;
 	refcount_t refcnt;
 	unsigned long flags;
 	size_t priv_size;