Overlay mms_config to increase allowed picture size

These image size values are kanged from old jf.

We should allow higher fidelity Mms as some people actually do still use it.

Addresses BACON-201

Change-Id: I441c27f571c20a3d183d887a3efd407be3640d82
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_oppo_msm8974-common into HEAD