Convert CONFIG_FSL_SATA_V2 to Kconfig

This converts the following to Kconfig:
   CONFIG_FSL_SATA_V2

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index ce6907e..9c9641d 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -113,12 +113,19 @@
 
 config FSL_SATA
 	bool "Enable Freescale SATA controller driver support"
+	depends on PPC
 	select AHCI
 	select LIBATA
 	help
 	  Enable this driver to support the SATA controller found in
 	  some Freescale PowerPC SoCs.
 
+config FSL_SATA_V2
+	bool "Enable support for V2 of the Freescale SATA controller"
+	depends on FSL_SATA
+	help
+	  Enable support for V2 of this controller, rather than V1.
+
 config SATA_MV
 	bool "Enable Marvell SATA controller driver support"
 	select AHCI