net: phy: Remove duplicate Kconfig selection for Micrel KSZ9021

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/phy/Kconfig

@@ -92,14 +92,6 @@ config PHY_MICREL_KSZ9031
 
 endif # PHY_MICREL
 
-config PHY_MICREL_KSZ9021
-	bool "Micrel KSZ9021 Ethernet PHYs support"
-	depends on PHY_MICREL
-	help
-          KSZ9021 is a completely integrated triple speed (10Base-T/100Base-TX/1000Base-T)
-	  Ethernet Physical Layer Transceiver for transmission and reception of data over
-	  standard CAT-5 unshielded twisted pair (UTP) cable.
-
 config PHY_MSCC
 	bool "Microsemi Corp Ethernet PHYs support"