Fixing legacy shortcuts which only specify packageName in the intent

dont get restored on apk install.

For various model update task, we only use targetComponent (unlike loader
where we all check packageName for legacy shortcuts).
This causes various shortcuts which only specity packageName in the intent
to get skipped during the check. Instead creating a pseudo component for
these shortcuts similar to IconCache

Bug: 62944669
Change-Id: I0aa0a4c15ef3ad88dc6cdd579a76315fb2ff780b