D23598: Make battery serial property constant

[Méven Car]

meven created this revision.
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REVISION SUMMARY
  Since serial property cannot change and has no NOTIFY function, mark it as constant, to avoid warnings when the property is used in qml expression.
  For instance in kinfocenter energy_info kcm :
  QQmlExpression: Expression file:///home/meven/kde/usr/share/kpackage/kcms/kcm_energyinfo/contents/ui/main.qml:452:29 depends on non-NOTIFYable properties:
  
    Solid::Battery::serial

REPOSITORY
  R245 Solid

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D23598

AFFECTED FILES
  src/solid/devices/frontend/battery.h

To: meven, #frameworks
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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