Convert CONFIG_CMD_SATA to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_SATA

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index 89476a6..3e48d58 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -57,6 +57,7 @@
 config MV78260
 	bool
 	select ARMADA_XP
+	imply CMD_SATA
 
 config MV78460
 	bool
@@ -113,6 +114,7 @@
 	bool "Support theadorable Armada XP"
 	select BOARD_LATE_INIT if USB
 	select MV78260
+	imply CMD_SATA
 
 config TARGET_CONTROLCENTERDC
 	bool "Support CONTROLCENTERDC"