aemfvp-a-rme: Add missing timeout config

Add the timeout buildroot config which was dropped in the
upgrade.

aemfvp-a-rme: Remove legacy Buildroot config

aemfvp-a-rme: Add missing config

Signed-off-by: Ben Taylor <ben.taylor@linaro.org>
Change-Id: I5c5fcdf555abdbca22895125a60ae30dcfc1f9ca