ARM: multi_v7_defconfig: enable network for BeagleBone Black

BeagleBone Black uses the TI CPSW ethernet controller, enable it in the
multi_v7_defconfig for testing coverage purposes.
Signed-off-by: NOlof Johansson <olof@lixom.net>
Acked-by: NTony Lindgren <tony@atomide.com>
Cc: stable@vger.kernel.org # v3.12

arch/arm/configs/multi_v7_defconfig

@@ -69,6 +69,7 @@ CONFIG_KS8851=y
 CONFIG_SMSC911X=y
 CONFIG_STMMAC_ETH=y
 CONFIG_MDIO_SUN4I=y
+CONFIG_TI_CPSW=y
 CONFIG_KEYBOARD_SPEAR=y
 CONFIG_SERIO_AMBAKMI=y
 CONFIG_SERIAL_8250=y