ata: Migrate CONFIG_SATA_MV to Kconfig

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
diff --git a/configs/db-mv784mp-gp_defconfig b/configs/db-mv784mp-gp_defconfig
index 23eaa12..6724af0 100644
--- a/configs/db-mv784mp-gp_defconfig
+++ b/configs/db-mv784mp-gp_defconfig
@@ -37,6 +37,7 @@
 # CONFIG_PARTITION_UUIDS is not set
 # CONFIG_SPL_PARTITION_UUIDS is not set
 CONFIG_SPL_OF_TRANSLATE=y
+CONFIG_SATA_MV=y
 # CONFIG_MMC is not set
 CONFIG_NAND=y
 CONFIG_NAND_PXA3XX=y