Merge remote-tracking branch 'remotes/huth-gitlab/tags/pull-request-2020-11-23' into...

Merge remote-tracking branch 'remotes/huth-gitlab/tags/pull-request-2020-11-23' into staging

* Two reboot fixes for the s390-ccw bios

# gpg: Signature made Mon 23 Nov 2020 10:03:17 GMT
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* remotes/huth-gitlab/tags/pull-request-2020-11-23:
  pc-bios/s390: Update the s390-ccw bios binaries
  pc-bios: s390x: Clear out leftover S390EP string
  pc-bios: s390x: Ensure Read IPL memory is clean

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>