boards/galileo: Enable ethernet in the default configuration

Enable it by default now that the eth_dw driver has been ported to the
new IP stack.

Jira: ZEP-1652
Change-Id: I39dd30d7231a657fc024ef32668156af7201f3f3
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>

Author: lpereira

boards/x86/galileo/galileo_defconfig

@@ -22,3 +22,6 @@ CONFIG_GPIO_SCH_0=y
 CONFIG_GPIO_SCH_1=y
 CONFIG_SHARED_IRQ=y
 CONFIG_SHARED_IRQ_0_LEVEL_LOW=y
+CONFIG_ETH_DW=y
+CONFIG_ETH_DW_0=y
+CONFIG_ETH_DW_0_IRQ_SHARED_NAME="SHARED_IRQ0"