arm: mvebu: add support for boot from SATA

Add the required Kconfig and macro definitions to allow boot from SATA
on Armada 38x systems.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index 495c48e..fdd3968 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -239,6 +239,11 @@
 	bool "SDIO/MMC card"
 	select SPL_LIBDISK_SUPPORT
 
+config MVEBU_SPL_BOOT_DEVICE_SATA
+	bool "SATA"
+	select SPL_SATA_SUPPORT
+	select SPL_LIBDISK_SUPPORT
+
 config MVEBU_SPL_BOOT_DEVICE_UART
 	bool "UART"