ata: ahci_mtk: add compile test support

Add Kconfig dependendy on COMPILE_TEST to allow compile tests with
configs that do not enable ARCH_MEDIATEK.
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>

drivers/ata/Kconfig

@@ -206,7 +206,7 @@ config AHCI_CEVA
 
 config AHCI_MTK
 	tristate "MediaTek AHCI SATA support"
-	depends on ARCH_MEDIATEK
+	depends on ARCH_MEDIATEK || COMPILE_TEST
 	select MFD_SYSCON
 	select SATA_HOST
 	help