Frameworks/base: Use equals for Integer comparison

Integer == is dangerous, as equal objects may not be identical
objects. In fact, MediaFormat.setInteger was creating a new object
every time.

Change MediaFormat.setInteger and setLong to use valueOf, which
may reuse returned objects.

Change-Id: Iedcc6003adbf05c0c870aa4b3ada7f181a5b870e
3 files changed