net: phy: declare package-related struct members only if CONFIG_PHY_PACKAGE is enabled

Now that we have an own config symbol for the PHY package module,
we can use it to reduce size of these structs if it isn't enabled.

Signed-off-by: Heiner Kallweit <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

include/linux/phy.h

···
 	/** @shared_lock: protect access to the shared element */
 	struct mutex shared_lock;
 
+#if IS_ENABLED(CONFIG_PHY_PACKAGE)
 	/** @shared: shared state across different PHYs */
 	struct phy_package_shared *shared[PHY_MAX_ADDR];
+#endif
 };
 #define to_mii_bus(d) container_of(d, struct mii_bus, dev)
 
···
 	/* For use by PHYs to maintain extra state */
 	void *priv;
 
+#if IS_ENABLED(CONFIG_PHY_PACKAGE)
 	/* shared data pointer */
 	/* For use by PHYs inside the same package that need a shared state. */
 	struct phy_package_shared *shared;
+#endif
 
 	/* Reporting cable test results */
 	struct sk_buff *skb;