Kconfig: net: phylib: Phylib should depends on NET

There is no value to enable phylib without networking support.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/phy/Kconfig

@@ -7,6 +7,7 @@ config MV88E6352_SWITCH
 
 menuconfig PHYLIB
 	bool "Ethernet PHY (physical media interface) support"
+	depends on NET
 	help
 	  Enable Ethernet PHY (physical media interface) support.