sunxi: Use the available Kconfig option for AHCI

Use the already available Kconfig option for AHCI. Tested on the
BananaPi.

Signed-off-by: Jelle van der Waa <jelle@vdwaa.nl>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/configs/Itead_Ibox_A20_defconfig b/configs/Itead_Ibox_A20_defconfig
index 1a8fad7..d544d50 100644
--- a/configs/Itead_Ibox_A20_defconfig
+++ b/configs/Itead_Ibox_A20_defconfig
@@ -6,7 +6,8 @@
 CONFIG_MMC0_CD_PIN="PH1"
 CONFIG_DEFAULT_DEVICE_TREE="sun7i-a20-itead-ibox"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
-CONFIG_SYS_EXTRA_OPTIONS="SUNXI_GMAC,AHCI,SATAPWR=SUNXI_GPB(8)"
+CONFIG_AHCI=y
+CONFIG_SYS_EXTRA_OPTIONS="SUNXI_GMAC,SATAPWR=SUNXI_GPB(8)"
 CONFIG_SPL=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set