refactor(qemu): common cpu features enablement

Enable SVE, SME, RNG, FGT in one place.

qemu gains FGT (needed for 'max' cpu to boot Linux)
qemu_sbsa gains RNG

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Change-Id: I2e8f971ef3e42d9ebe9f20641b288cc8c40f806a
3 files changed