Bug#977466: rootskel: bterm cannot start when requesting graphical console and serial console at the same time

[Wang Shanker <shankerwangmiao@gmail.com>]

Dear Maintainers,

I wonder if the two patches to debian-installer can be applied to 
stable-pu, so that users (especially those who are using arm64 
platforms) installing the latest stable debian version will get
a working console on screen.

Also, it will be nice if my name can be corrected as ``Miao Wang"
in the changelog of rootskel. :-)

Cheers，

Miao Wang