board: atmel: sama5d2_wlsom1_ek: add qspi support and qspi boot config

Add support for qspi memory on board. Created boot support for QSPI
for both u-boot proper and SPL.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
diff --git a/board/atmel/sama5d27_wlsom1_ek/MAINTAINERS b/board/atmel/sama5d27_wlsom1_ek/MAINTAINERS
index 59671ac..ff68cf0 100644
--- a/board/atmel/sama5d27_wlsom1_ek/MAINTAINERS
+++ b/board/atmel/sama5d27_wlsom1_ek/MAINTAINERS
@@ -5,3 +5,4 @@
 F:	board/atmel/sama5d27_wlsom1_ek/
 F:	include/configs/sama5d27_wlsom1_ek.h
 F:	configs/sama5d27_wlsom1_ek_mmc_defconfig
+F:	configs/sama5d27_wlsom1_ek_qspiflash_defconfig