Fix link-type check warning on ApiDemos

ApiDemos has been using private APIs from telephony-common to
demonstrate the Mms feature. However, this is causing link-type check
warning because ApiDemos itself is built with SDK (LOCAL_SDK_VERSION is
set) but telephony-common isn't. As we are working on to promote the
warnings into errors, this warnings must be fixed.

Fixing the warning by copying the PDU classes from telephony-common, so
that there is no need to link to the library. Also the package name for
the copied classes are all changed in order to prevent the collision
with the same classes in telephony-common which is in the boot class
path.

Test: m -j ApiDemos is successful and does not show any link-type check
warning.

Change-Id: Ica508cd4daf3640e4f90fa26dd11dfd03867d717
27 files changed