mpc8315e-rdb: move wks file to wic/ directory

Moved mpc8315e-rdb.wks from scripts/lib/wic/canned-wks/ to
layer wic/ directory to gather all wks files for reference
BSPs in one place.

(From meta-yocto rev: 73337565a4489225a9a204aaf24b8fa82fdb821e)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-yocto-bsp/wic/mpc8315e-rdb.wks

@@ -0,0 +1,4 @@
+# short-description: Create SD card image for MPC8315E-RDB
+# long-description: Create a partitioned SD card image for Freescale MPC8315E-RDB reference hardware.
+part /boot --source bootimg-partition --ondisk sdb --fstype=ext3 --label boot
+part / --source rootfs --ondisk sdb --fstype=ext3 --label root