cm: Add some app-specific performance settings

Change-Id: I2fd6561a17ae5dd17a825b82dc861d684c20d546
recovery: default recovery updating to false

Default recovery flashing on system updates to false. This can be
overridden for specific builds/devices, but the option can be enabled
or disabled on all builds.

Change-Id: Ia1bc94bd1e5f799fc894286a6b2f4f7a8a3816dd
Persist DPI across installs
Add OmniSwitch