Move the FVP power driver to a directory under the FVP platform
port as this is not a generically usable driver.
Change-Id: Ibc78bd88752eb3e3964336741488349ac345f4f0
The FVP platform has a few filenames that begin with fvp_. These are
renamed to plat_ to make it easier to use the FVP port as a template.
Change-Id: I601e6256d5ef3bae81a2e1f5df6de56db5b27069
Signed-off-by: Ryan Harkin <ryan.harkin@linaro.org>