maintainers: Add Julius Werner for coreboot and console API
maintainers: Add Julius Werner for coreboot and console API

I wrote most of this code and have a vested interest in keeping it
healthy, so adding myself as a maintainer.

Change-Id: I0edeebbc8336b6976dfaf393b3cfc7bc94089ac6
Signed-off-by: Julius Werner <4d12f06cff3725783b352157673a720bc67c4afe@chromium.org>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware