board: atmel: sama5d2_wlsom1_ek: add SPL support

Add support for SPL for this board: DRAM initialization, PMC initialization,
MMC boot.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index ce0b1b4..1434328 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -189,6 +189,7 @@
 	select BOARD_EARLY_INIT_F
 	select BOARD_LATE_INIT
 	select CPU_V7A
+	select SUPPORT_SPL
 	help
 	  The SAMA5D27 WLSOM1 embeds SAMA5D2 SiP (System in Package),
 	  a 64Mbit QSPI flash with Mac-address, KSZ8081 Phy. A wireless