ata: Migrate CONFIG_DWC_AHSATA to Kconfig

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
diff --git a/configs/mx6cuboxi_defconfig b/configs/mx6cuboxi_defconfig
index 37a2f2a..05eaf12 100644
--- a/configs/mx6cuboxi_defconfig
+++ b/configs/mx6cuboxi_defconfig
@@ -28,6 +28,7 @@
 # CONFIG_SPL_PARTITION_UUIDS is not set
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_DM=y
+CONFIG_DWC_AHSATA=y
 CONFIG_PHYLIB=y
 CONFIG_DM_THERMAL=y
 CONFIG_USB=y