D11129: Mark kpackage_install_package undeprecated for plasma_install_package

[Friedrich W . H . Kossebau]

kossebau added a dependent revision: D11130: Disable deprecation warning from 
kpackage_install_package for now.

REPOSITORY
  R290 KPackage

REVISION DETAIL
  https://phabricator.kde.org/D11129

To: kossebau, mart, apol
Cc: #frameworks, michaelh