aemfvp-a-rme: Added fixes for build

Added a number of fixes for the build including:

--restricted-mem parameter for kvm
Add additional virtio kernel parameters
Correct UUID's in debian build
Tidied up rootfs
Remove earlycon

Signed-off-by: Ben Taylor <ben.taylor@linaro.org>
Change-Id: I51ed0e93439c142416bd0b4a15fa8d48ba506cae