armv8/ls1043aqds: add QSPI boot support

Enable the U-Boot Driver Model(DM) to use the Freescale QSPI driver.

Signed-off-by: Gong Qianyu <Qianyu.Gong@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls1043aqds/README b/board/freescale/ls1043aqds/README
index 6261a77..a6fd7a3 100644
--- a/board/freescale/ls1043aqds/README
+++ b/board/freescale/ls1043aqds/README
@@ -94,3 +94,4 @@
 b) NOR boot
 c) NAND boot
 d) SD boot
+e) QSPI boot