config/ast2600: Enable I2C driver

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/configs/evb-ast2600_defconfig b/configs/evb-ast2600_defconfig
index 5c4d842..6aa61d1 100644
--- a/configs/evb-ast2600_defconfig
+++ b/configs/evb-ast2600_defconfig
@@ -69,6 +69,7 @@
 CONFIG_ASPEED_ACRY=y
 CONFIG_ASPEED_GPIO=y
 CONFIG_DM_I2C=y
+CONFIG_SYS_I2C_ASPEED=y
 CONFIG_MISC=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ASPEED=y