Workaround issue with homescreen-demo-ci with AGLCI on

Ensure we can build master with AGLCI on.

This fixes:
Error:
 Problem: package packagegroup-agl-demo-platform-1.0-r0.noarch requires packagegroup-hmi-framework, but none of the providers can be installed
  - conflicting requests
  - nothing provides homescreen-demo-ci needed by packagegroup-hmi-framework-1.0-2.noarch
(try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)

until we can debug the root cause.

Bug-AGL: SPEC-3718
Signed-off-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Change-Id: Ide1836430622f91a34a7acb012c444b26c983505