ata: Migrate CONFIG_MVSATA_IDE to Kconfig

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
diff --git a/configs/sheevaplug_defconfig b/configs/sheevaplug_defconfig
index 6145077..21704ec 100644
--- a/configs/sheevaplug_defconfig
+++ b/configs/sheevaplug_defconfig
@@ -25,6 +25,7 @@
 CONFIG_CMD_UBI=y
 CONFIG_ISO_PARTITION=y
 CONFIG_ENV_IS_IN_NAND=y
+CONFIG_MVSATA_IDE=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y