stmmac: drop unused Kconfig symbol

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

drivers/net/stmmac/Kconfig

@@ -20,15 +20,6 @@ config STMMAC_DA
 	  By default, the DMA arbitration scheme is based on Round-robin
 	  (rx:tx priority is 1:1).
 
-config STMMAC_DUAL_MAC
-	bool "STMMAC: dual mac support (EXPERIMENTAL)"
-	default n
-        depends on EXPERIMENTAL && STMMAC_ETH && !STMMAC_TIMER
-	help
-	  Some ST SoCs (for example the stx7141 and stx7200c2) have two
-	  Ethernet Controllers. This option turns on the second Ethernet
-	  device on this kind of platforms.
-
 config STMMAC_TIMER
 	bool "STMMAC Timer optimisation"
 	default n