armv8: ls1046ardb: Add falcon mode for for QSPI boot

A new defconfig is introduced to support SPL boot from QSPI NOR
flash. This is to support falcon mode for faster booting into
Linux.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls1046ardb/ls1046ardb_rcw_qspi.cfg b/board/freescale/ls1046ardb/ls1046ardb_rcw_qspi.cfg
new file mode 100644
index 0000000..7b9be0a
--- /dev/null
+++ b/board/freescale/ls1046ardb/ls1046ardb_rcw_qspi.cfg
@@ -0,0 +1,7 @@
+#PBL preamble and RCW header
+aa55aa55 01ee0100
+# RCW
+0c150010 0e000000 00000000 00000000
+11335559 40005012 40025000 c1000000
+00000000 00000000 00000000 00238800
+20124000 00003101 00000096 00000001