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/Bananapro_defconfig b/configs/Bananapro_defconfig
index 9b39124..2b9c865 100644
--- a/configs/Bananapro_defconfig
+++ b/configs/Bananapro_defconfig
@@ -9,7 +9,8 @@
 CONFIG_GMAC_TX_DELAY=3
 CONFIG_DEFAULT_DEVICE_TREE="sun7i-a20-bananapro"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
-CONFIG_SYS_EXTRA_OPTIONS="SUNXI_GMAC,RGMII,MACPWR=SUNXI_GPH(23),AHCI"
+CONFIG_AHCI=y
+CONFIG_SYS_EXTRA_OPTIONS="SUNXI_GMAC,RGMII,MACPWR=SUNXI_GPH(23)"
 CONFIG_SPL=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set