d2-common: Mms: change useragent and profile to i9300

i9100 gives us an odd issue with received Mms pictures being very small.
i9300 works much better.

Also commonize this overlay since it doesn't differ between gsm and cdma.

Thanks to razorloves for pointing this out

Change-Id: I95f612248f4dd12a8867b7b55a2180aad9ea6cb8