Fix SystemUI count down doesn't work

StatusBarIconView uses Icon#loadDrawableAsUser to load drawable defined
by the customized Drawable class. context.createContextAsUser with flag
Context.CONTEXT_INCLUDE_CODE can fix the ClassNotFound found problem.
And, it needs to prevent any security issue by checking if the context
is the same app with the process.

If the parameter userId is the same with context.getUserId(), it
shouldn't create the extra Context instance.

Fixes: 171712189
Test: atest \
    CtsGraphicsTestCases:android.graphics.drawable.cts.IconTest \
    FrameworksCoreTests:android.graphics.drawable.IconTest
Change-Id: I267fc6eed90a6a6bba39b9976c1d843734e49dec