Add a default MMS UA

The default user-agent isn't set, which makes
TelephonyManager.getMmsUserAgent() return an empty string when a
device doesn't have one in its own overlays. Every hardware should
set its own unique name for this, but add a default value for cases
in which is is forgotten.

Fixes android.telephony.cts.TelephonyManagerTest#testTelephonyManager

Change-Id: I8a648014873319ea0d0f1089495d6777b8a1b8bf

Conflicts:

	overlay/common/frameworks/base/core/res/res/values/config.xml
Add a default MMS UA Profile URL

Companion change to I8a648014873319ea0d0f1089495d6777b8a1b8bf,
config_mms_user_agent_profile_url can't be empty either

Change-Id: Ib6b34972439818da47c389377664e75263dfd21b
Under da hood brandang

Change-Id: I350ac13b16459ed58a2816b0a7e247139fc0f08d