powerpc/B4860: enable PBL tool for B4860

Use a default RCW of protocol 0x2A_0x98, and a PBI configure file which
uses CPC1 as 512KB SRAM, then PBL tool can be used on B4860 to build a
pbl boot image.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
diff --git a/board/freescale/b4860qds/b4_rcw.cfg b/board/freescale/b4860qds/b4_rcw.cfg
new file mode 100644
index 0000000..577dabf
--- /dev/null
+++ b/board/freescale/b4860qds/b4_rcw.cfg
@@ -0,0 +1,7 @@
+#PBL preamble and RCW header
+aa55aa55 010e0100
+# serdes protocol 0x2A_0x98
+140e0018 0f001218 00000000 00000000
+54980000 9000a000 f8025000 a9000000
+01000000 00000000 00000000 0001b1f8
+00000000 14000020 00000000 00000011