ata: dwc_ahsata: Add ahci driver model support

Disable this support for cm_fx6 to avoid breakage.

Signed-off-by: Soeren Moch <smoch@web.de>
diff --git a/configs/cm_fx6_defconfig b/configs/cm_fx6_defconfig
index 6156ac2..2178170 100644
--- a/configs/cm_fx6_defconfig
+++ b/configs/cm_fx6_defconfig
@@ -51,6 +51,7 @@
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
 CONFIG_DWC_AHSATA=y
+# CONFIG_DWC_AHSATA_AHCI is not set
 CONFIG_DM_KEYBOARD=y
 CONFIG_DM_MMC=y
 CONFIG_FSL_ESDHC=y