arm64: defconfig: Enable Amazon Elastic Network Adaptor

The Graviton SoCs available in AWS use a custom network adaptor, enable
support for this in defconfig so standard defconfig builds can be used more
readily in CI. The driver is left as a module since it is relatively
unlikely these will be netbooted.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241212-arm64-defconfig-graviton-v1-1-86830c3d572b@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/configs/defconfig

@@ -330,6 +330,7 @@ CONFIG_VIRTIO_NET=y
 CONFIG_MHI_NET=m
 CONFIG_NET_DSA_BCM_SF2=m
 CONFIG_NET_DSA_MSCC_FELIX=m
+CONFIG_ENA_ETHERNET=m
 CONFIG_AMD_XGBE=y
 CONFIG_NET_XGENE=y
 CONFIG_ATL1C=m