14.03: remove big-LITTLE-MP.conf from instructions

This config fragment was deprecated a long time ago but was never
removed from the instructions.

Signed-off-by: Ryan <ryan.harkin@linaro.org>
14.03: update release date references

Update the filenames and various date markers to 14.03.

Signed-off-by: Ryan Harkin <ryan.harkin@linaro.org>